Volume 23 (1871) (426 pages)

236 SCIENTIFIC PRESS. {October 14, 1871. ON THE ASSAY OF GOLD. BY HENRY G. HANKS. [Expressly for the Prrss.—Continued.] When several assays of gold hnllion are to be made together, the plan of operation is somewhat modified. Let it be reqnired to condnet nine assays at once. Certain tools and appliances will be necessary which have not yet been described. A piece of hard wood is made abont four inches sqnare and an inch in thickness. On one side a portion of the wood projects to serve as a haudle; nine half inch holes are bored in the square part nearly through the thickness. On the nnder snrface in each corner a small knob is screwed which serves as feet to raise the board above the table. In each of the holes is to be placed a tnbe of glass closed at one end. The other end is cnt off sqnare and gronnd flat on a grind stone or emery wheel. The sizeof thetnbes is snch that they can be easliy removed andreplacedin the holes. The tnbes area little more than an inch long, so that they can be easily grasped with the finger and thnmb when it is reqnired to remove them from the holes. Each of the tubes are marked with a letter of the alphabet from A to I inclnsive. “This may be done with a writing diamond or with a corner of a freshly broken file. Near each hole is also stamped a letter, using the same set as those marked on the tnhes. For want of a hetter name let this he called a ‘‘ tnbe rack.’ On commencing the assay the bars are first to be stamped with the running nnmber of the assays, to correspond with the entries in the record book of the assay office. Similar entries are then made on a small memorandnm book and to each entry the letters are added, thns, No. 794, A.—No. 795, B.—No. 796, C.—etc. The bars are then all taken to the anvil and assay chips are cnt from them, or borings taken in the manner hefore described. The clippings from the bar stamped 794 must be pnt into the tnbe marked ‘‘ A,” which is then placed in its proper hole. Those of 795 in the tnhe marked ‘'B,”’ etc., etc. The bars are then set aside and the tnbe rack taken to the balance. Here other pieces of apparatus will be reqnired. A sqnare block of wood with a single hole bored in it the same size and depth of those in the tnbe rack, and another sqnare piece of wood with handle of the same size and thickness as the tnbe rack; bnt instead of holes, nine hemispherical cavities are cnt, each of which is abont an inch in diameter, and half aninch deep. These cavities are marked with the same letters and in the same snccession as those of the tnbe rack. The tnbe marked ‘‘A’’ is lifted from the rack and placed vertically in the hole in the block, which serves for a temporary stand forit. The clippings that are contained in it must previonsly be ponred ont on a clean piece of paper placed for convenience inside the balance case. After the assays are weighed ont the remaining gold is pnt back intothe tnhe rack. Theassays in their leaden euvelopes are placedin the cavity marked ‘‘A.” ‘B” is then treated in the same way, and so on through the whole set. Nine cnpels are then marked and placed in the mnfile in the same order and with the same letters. The object of marking the cnpels is, that it is sometimes necessary to chauge their position in the muffle. And sometimes even to take one or more of them out, hefore the others are finished. The manner of niarking the cnpels is as follows: Some red chalk is gronnd fine, mixed with water and kept in a small wide monthed bottle for use. When it is reqnired to mark enpels, the contents of the bottle aremixed and apphed with a small camel's hairbrnsh. The . enpels shonld be marked on two sides. ‘When the cnpels are taken from the mufile, they are placed in a rack of sheet iron divided into nine compartments, and when the bnttons are removed they are placed back into the cavities in the board from which they were taken when placed in the cupels. This serves to convey them to the balance when they are weighed, alloyed with silver and returned to the mufile for second cupellation. It will be seen that to this stage the assays are always kept in compartments hearing their mark, and with ordinary care no mistake can ocenr. When the assays are alloyed with silver and rolled ont, a letter is stamped on the end of each, somewhat deeply. The assay is then rolled np in spiral form in the nsnal manner commencing at the end which is not stamped. This letter will be as distinctly seen after boiling in acid as before. The cornets are then placed in flasks, boiled with acid and dried in the nsnal manner. Ithas been recommended to place all of the cornets in one flask and after boiling, to invert it in a somewhat capacions dish of water; to pick ont the cornets with a pair of forceps, and . to anneal them altogether in the mufile ona tile. . I have never tricd it, bnt I cousider it to be un. safe, as with the best of care the cornets are sometimes broken in the boiling. The elegant plan of boiling a nnmber of cornets in baskets . of platinnm wire, in the same vessel, is open to the same objection. The manner of nsing the proof is as follows: first consider what will be the average fineness of the assays yon are condneting. Your preliminary assays will furnish yon the data. Let it be snpposed that this average will be .950 weigh ont 950-thonsandths of pure gold, alloy it with 2% its weight of silver and cnpel it in the muffie with the nine assays, boil with the same acid, and nnder exactly similar cirenmstances, heat it to redness in a dry cnpand weigh it. It will generally be found to have increased in weight owing to the snrcharge beingin excess of the mechanical loss. What the proof has gained in weight mnst be subtracted from the other assays, when many assays are to be niade from the samé mine; an alloy of copper, silver and pure gold mnst be made np as nearly identical as can be with the composition of the bnilion, and this alloy nsed asa proof. Of course a full nnit must be employed in this case. There are a few points to be borne in mind in making the bnilion assay to insnre success, The alloy of gold and silver shonld not be rolled ont too thin as it is likely to be broken when this precantion is disregarded. The cornet mnst never be weighed withont being heated to redness. Simple drying will not give correct resnlts. In boiling with acid, .the flasks shonld be tnrned on their sides at an inclination of 45° to prevent loss of acid in the event of sndden ebullition. A gradnated measnre shonld be nsed for the acid, that the amonnt pnt in each flask shall be equal. Commou water shonld never be nsed in washing the cornet, as chloride of silver is formed in the pores of the gold, which cannot be removed, and which being insolnhle in acid remains in the cornet and gives incorrect resnlts. Gold is always weighed in Troy onnces and. decimals. Itis best to have the onncesin decimals also. A convenient set shonld be constructed as follows: Ounces. 500 Decimals 0,500 tested for accuracy, and compared with a standard set. Althongh itis hetter to be provided with a fnll set of weights and a good hnilion balance, still it is possible to weigh very closely with a set of 20 onnces and decimals, and a set of avordnpois ponnds on a good common balance, by connterpoising, which has heen before described. Each ponnd avordnpois is 14.5833 Troy onnces. What the bar lacks of a ponnd mnst be made np with Troy onnces and decimals. The nuniber of ponnds is to be multiplied by the factor given above and this snm added to the onnce weights nsed to complete the weighing. The result will he the weight of the bar in Troy onnces and decimals. Of conrse the pound weights mnst he examined and their acuracy verified. It may sometimes be interesting to know the relation between the fineness of gold and its value in carats. Pure gold (1000 fine) is said to be 24 carats fine, 12 carats wonld evidently be 500 fine or one-half gold—all gold is so computed in England, the standard being 22 Carats; gold of 23 carats is said to be one carat ‘better’ as 21 would be one carat ‘‘worse.”’ The following table will show the relative valne : 0.041667 AnrrScate Compounp.—We would call the attention of engineers and others tothe advertisement, in another column, of Rickard & Durden’s Anti-Scale Compound, one of the most valuable preparations for the purpose intended, which has ever been presented to the public. A full notice of this preparation was given in the ScmytTir1c Press about three months since. A Canprpate.—Mr. Ira H. Reed, of West Point, Calaveras Co., an old subscriber and reliable correspondent of the Screnrivic Press, announces to us that, although no politician, he is a candidate for engrossing clerk of the next State Assembly. Removal. The entire business office of the Scrmntric Press, Pacrrio Rurau Press, and onr U. S. and Foreign Patenr AcENnoy and EineRavinG establishment, has been removed to No. 338 Montgomery street, on the southeast corner of California street, diagonally opposite Wells, Fargo & Co.’s. ComBInaTIon GRAIN HarvesTeR.—B. F. Cook, of Napa, the inventor of several interesting machines, (someof which have been patented) has combined a Haines’ header with a Pitts’ thresher, and a portable threshing engine, whereby he cuts the grain in the field, threshes, cleans and sacks itin one operation. His model at the State Fair showed the plausibility of his plan in theory. He adjusts the machinery so that all the work of cutting, threshing and cleaning can be done by the power of the engine if desired, so as to leave no work for the teams, but to draw the machine. He has an ingenious method of leveling parts of the machine, whereby the engine and bviler cau be kept constantly level over uneven or sideling ground. Working experiments in the field have conviuced Mr. C. that his machine is practical, and we hope we will find ample means to help him demonstrate most speedily its value. His machine is calculated to cut 18 feet wido. © ApouT THE Loss OF QUICKSILVE RB.’ The communication under the above title, which appears on the third page of the present issue, found its way there through inadvertence. The writer evidently misunderstands both the nature of the’ information asked for by Mr. Panl, and the object in seeking that information; and we presume no miner will be so misled as to suppose that Mr. P. has any other object in view in seeking for the information than the general benefit of the miners themselves. Tur Gonpen Stare Iron Works(co-operative)are putting up a number of Stevenson’s mouldboard paus ‘of a large size, and some eight-foot settlers, for the Metropolitan Mill and Mining Co., Eureka, Nevada. They are also making some large hydraulic and scrow presses for the viueyards of Eberhardt and Lachman. The castings and condensers forthe Kuox and Osborne’s Patent Furnace for the Pheenix Quicksilver Mine in Pope Valley, Napa Co., are under way. ‘The men are also at work on large quantities of White and Grey Iron }castings for stamp aud pan shoes and dies. TInrortant Water Surr.—A suit involying the title to certain water privileges, was decided last week by Judge Field. The action was brought by the City of Gold Hill Water Co. to enjoin the Cole §S. M. Co. from certain water privileges. A temporary injunction was allowed by the United States Cireuit Court. The case was subsequently heard by J udge Field, Associate Justice of the U.S. Supreme Court, who made an order dissolving the injunction, leaving the Cole S. M. Co. in possession of their privileges. State Fair Gold Medals, By an advertisement in Ruran Press it will be seen that all claimants to the State Agricultural Society’s Gold Meadals are required to furnish statements relative to the manufacture or production of the articles exhibited, and on which they claim the award of the medal, or npon which they base their claim of merit. Tus San Francisco Guass Works, situated on King street near Fourth, in this city, commenced operations again on the 12th inst. Mr. Newman, who is in charge, informs us that everything is now in readi ness for orders in this line. Avertnu’s Caemican Paryt.—An advertisement of this valuable product will be found in another column. This is the same paint of which we gave a lengthy description in our last week’s issue, Complete Volumes of the Scientific Pre irom January, 1864, can be had at this office at $3 Gee Xqiume: Bound in cloth, $5. A limited number only on hand. CouGHs.—THE ADMINISTRATION OF MepieraL Prep. arations in the form of a lozenge is of all modes ths most eligible and convenient, more especially as regards “Brown's Bronchial Troches," or Cough Lozenges, allay irritation which induces cough. ing, giving instant relief in Bronchitls, Hoarseness, In. a CoucH Rrmepy. fluenza, and Consumptive and Asthmatic complaints. Opera Glasses, ‘Pebble Spectacles, and Eyeglasses, in great variety. wholesale and retnil. CG MULLER, Optician, 205 Montgomery street, Russ Block, San Francisco, Tv23-3m. Scientific and Practical BOOKS os MINING, METALLURGY, ETC. BY GUIDO KUSTEL MINING ENGINEER AND METALLuRGIsT. Published and Sold by DEWEY & CO. Roasting of Gold and Silver Ores, and the Extraction of their Respective Metals without Quick. silver. 1870. This rare book on the treatment of gold and silver ores without quicksilver, is liberally illustrated and crammed full of facts. It gives short and concise descriptions of various processes and apparatus employed in this country and in Europe, and explains the why and wherefore. It contains 142 pages, embracing illustrations of furnaces, implements and workiug apparatus. It isa work of great merit, by an author whose reputation is unsurpassed in his speciality. Price $2.50 coin, or $3 currency, postage free. Concentration of Ores (of all kinds), ineluding the Chlorination Process for Gold-bearing Sulphurets, Arseniurets, and Gold and Silver Ores generally, with 120 Lithographle Diagrams, 1867. This work is unequaled by any other published, embracing the subjects treated. Its authority is highly estecmced and regarded by its readers; containing, as it does, much essential information to the Miner, Millman, Mctallurgist, and other professional workers in ores and minerals, which cannot he fonnd elsewhere in print, It also abounds throughout with facts and instructions rendered valuable by heing clearly rendered together and insimple order. It contains 120 diagrams, illustrating machinery, etc., which alone are of the greatest value. Price, $7.50, postage paid., = Nevada and California Processes of Silver and Gold Extraction, for general use, and especially for the Mining Public of California and Nevada, with full e: ions and directi for all metallurgical operations connected with silver and gold from a prelimlnary examinatlon of the ore to the final castlng of the ingot. Also,a description of the general metallurgy of silver ores. 1864. As its title indicates, this work gives a wide range of information, applicable to all vein miners and workers in precious metals, affording hints and assistance of excccding value to hoth the moderately informed and the most expert operator. Price, $5in cloth; $6 ln lesther—coin. For single copies of the ahove works, or for the trade, address DEWEY & CoO., Publishers and Patent Agents, Scientific Press Office San Frandisco. Phelps’ Patent Animal Tran, a ee = FOR GOPHERS, SQIRRELS, RATS, CAYOTES, a and other ‘’ Varmints.” This Trap, as may be seen, is of simple construction, and not likely to get out of order, and very durable. It is Very Efficient and can he used conveniently by women or children. THE OHEAPEST AND BEST YET INVENTED. Price 50 cents. By mail, prepaid (to places where express charges are high), $1. A liheral discount to clubs or dealers who buy by the dozen. Address the inventor and manufacturer, D.N. PHELPS, * al-ly-awhp San Leandro, Alamedz County, Cal. OPAL GAS GLOBES. An Entirely New Article, with Patent Doubie Burner. For Softness and Brilliancy of Light it has no equal. For Sale hy THOMAS DAY, 732 Montgomery street and 335 Plne strect, 4.51 ocl San FRANcisco. BETTS’S CAPSULE PATENTS. To prevent INFRINGEMENTS, NOTICE IS HEREBY GIVEN, that BETTS'S NAME is ON EVERY OAPSULE he makes for the principal merchants in England and ¥rance, thus enabling vendor, purchaser, and consumer, not only to identify the ennineness of the Capsule, but likewise the contents of the vessel to which it is applied. The Lord Chancellor, in his indement, said that the Capsnles are not used merely for the pnrpose of the ornament but that they are perigee in protecting the wine from injury, and insuring its genuineness. Max BACTORIAS:—1, WHARF ROAD, CITY ROAD, MLONDON. AND BORDEAUX, FRANCE. J. M. STOCKMAM, Manufacturer of PATTERNS AND MODELS. (Over W. T. Garratt's Brass Foundry). Entrance, No. 129 Fremont street, San Francisco. &y23-3m

236 SCIENTIFIC PRESS. {October 14, 1871. ON THE ASSAY OF GOLD. BY HENRY G. HANKS. [Expressly for the Prrss.—Continued.] When several assays of gold hnllion are to be made together, the plan of operation is somewhat modified. Let it be reqnired to condnet nine assays at once. Certain tools and appliances will be necessary which have not yet been described. A piece of hard wood is made abont four inches sqnare and an inch in thickness. On one side a portion of the wood projects to serve as a haudle; nine half inch holes are bored in the square part nearly through the thickness. On the nnder snrface in each corner a small knob is screwed which serves as feet to raise the board above the table. In each of the holes is to be placed a tnbe of glass closed at one end. The other end is cnt off sqnare and gronnd flat on a grind stone or emery wheel. The sizeof thetnbes is snch that they can be easliy removed andreplacedin the holes. The tnbes area little more than an inch long, so that they can be easily grasped with the finger and thnmb when it is reqnired to remove them from the holes. Each of the tubes are marked with a letter of the alphabet from A to I inclnsive. “This may be done with a writing diamond or with a corner of a freshly broken file. Near each hole is also stamped a letter, using the same set as those marked on the tnhes. For want of a hetter name let this he called a ‘‘ tnbe rack.’ On commencing the assay the bars are first to be stamped with the running nnmber of the assays, to correspond with the entries in the record book of the assay office. Similar entries are then made on a small memorandnm book and to each entry the letters are added, thns, No. 794, A.—No. 795, B.—No. 796, C.—etc. The bars are then all taken to the anvil and assay chips are cnt from them, or borings taken in the manner hefore described. The clippings from the bar stamped 794 must be pnt into the tnbe marked ‘‘ A,” which is then placed in its proper hole. Those of 795 in the tnhe marked ‘'B,”’ etc., etc. The bars are then set aside and the tnbe rack taken to the balance. Here other pieces of apparatus will be reqnired. A sqnare block of wood with a single hole bored in it the same size and depth of those in the tnbe rack, and another sqnare piece of wood with handle of the same size and thickness as the tnbe rack; bnt instead of holes, nine hemispherical cavities are cnt, each of which is abont an inch in diameter, and half aninch deep. These cavities are marked with the same letters and in the same snccession as those of the tnbe rack. The tnbe marked ‘‘A’’ is lifted from the rack and placed vertically in the hole in the block, which serves for a temporary stand forit. The clippings that are contained in it must previonsly be ponred ont on a clean piece of paper placed for convenience inside the balance case. After the assays are weighed ont the remaining gold is pnt back intothe tnhe rack. Theassays in their leaden euvelopes are placedin the cavity marked ‘‘A.” ‘B” is then treated in the same way, and so on through the whole set. Nine cnpels are then marked and placed in the mnfile in the same order and with the same letters. The object of marking the cnpels is, that it is sometimes necessary to chauge their position in the muffle. And sometimes even to take one or more of them out, hefore the others are finished. The manner of niarking the cnpels is as follows: Some red chalk is gronnd fine, mixed with water and kept in a small wide monthed bottle for use. When it is reqnired to mark enpels, the contents of the bottle aremixed and apphed with a small camel's hairbrnsh. The . enpels shonld be marked on two sides. ‘When the cnpels are taken from the mufile, they are placed in a rack of sheet iron divided into nine compartments, and when the bnttons are removed they are placed back into the cavities in the board from which they were taken when placed in the cupels. This serves to convey them to the balance when they are weighed, alloyed with silver and returned to the mufile for second cupellation. It will be seen that to this stage the assays are always kept in compartments hearing their mark, and with ordinary care no mistake can ocenr. When the assays are alloyed with silver and rolled ont, a letter is stamped on the end of each, somewhat deeply. The assay is then rolled np in spiral form in the nsnal manner commencing at the end which is not stamped. This letter will be as distinctly seen after boiling in acid as before. The cornets are then placed in flasks, boiled with acid and dried in the nsnal manner. Ithas been recommended to place all of the cornets in one flask and after boiling, to invert it in a somewhat capacions dish of water; to pick ont the cornets with a pair of forceps, and . to anneal them altogether in the mufile ona tile. . I have never tricd it, bnt I cousider it to be un. safe, as with the best of care the cornets are sometimes broken in the boiling. The elegant plan of boiling a nnmber of cornets in baskets . of platinnm wire, in the same vessel, is open to the same objection. The manner of nsing the proof is as follows: first consider what will be the average fineness of the assays yon are condneting. Your preliminary assays will furnish yon the data. Let it be snpposed that this average will be .950 weigh ont 950-thonsandths of pure gold, alloy it with 2% its weight of silver and cnpel it in the muffie with the nine assays, boil with the same acid, and nnder exactly similar cirenmstances, heat it to redness in a dry cnpand weigh it. It will generally be found to have increased in weight owing to the snrcharge beingin excess of the mechanical loss. What the proof has gained in weight mnst be subtracted from the other assays, when many assays are to be niade from the samé mine; an alloy of copper, silver and pure gold mnst be made np as nearly identical as can be with the composition of the bnilion, and this alloy nsed asa proof. Of course a full nnit must be employed in this case. There are a few points to be borne in mind in making the bnilion assay to insnre success, The alloy of gold and silver shonld not be rolled ont too thin as it is likely to be broken when this precantion is disregarded. The cornet mnst never be weighed withont being heated to redness. Simple drying will not give correct resnlts. In boiling with acid, .the flasks shonld be tnrned on their sides at an inclination of 45° to prevent loss of acid in the event of sndden ebullition. A gradnated measnre shonld be nsed for the acid, that the amonnt pnt in each flask shall be equal. Commou water shonld never be nsed in washing the cornet, as chloride of silver is formed in the pores of the gold, which cannot be removed, and which being insolnhle in acid remains in the cornet and gives incorrect resnlts. Gold is always weighed in Troy onnces and. decimals. Itis best to have the onncesin decimals also. A convenient set shonld be constructed as follows: Ounces. 500 Decimals 0,500 tested for accuracy, and compared with a standard set. Althongh itis hetter to be provided with a fnll set of weights and a good hnilion balance, still it is possible to weigh very closely with a set of 20 onnces and decimals, and a set of avordnpois ponnds on a good common balance, by connterpoising, which has heen before described. Each ponnd avordnpois is 14.5833 Troy onnces. What the bar lacks of a ponnd mnst be made np with Troy onnces and decimals. The nuniber of ponnds is to be multiplied by the factor given above and this snm added to the onnce weights nsed to complete the weighing. The result will he the weight of the bar in Troy onnces and decimals. Of conrse the pound weights mnst he examined and their acuracy verified. It may sometimes be interesting to know the relation between the fineness of gold and its value in carats. Pure gold (1000 fine) is said to be 24 carats fine, 12 carats wonld evidently be 500 fine or one-half gold—all gold is so computed in England, the standard being 22 Carats; gold of 23 carats is said to be one carat ‘better’ as 21 would be one carat ‘‘worse.”’ The following table will show the relative valne : 0.041667 AnrrScate Compounp.—We would call the attention of engineers and others tothe advertisement, in another column, of Rickard & Durden’s Anti-Scale Compound, one of the most valuable preparations for the purpose intended, which has ever been presented to the public. A full notice of this preparation was given in the ScmytTir1c Press about three months since.

A Canprpate.—Mr. Ira H. Reed, of West Point, Calaveras Co., an old subscriber and reliable correspondent of the Screnrivic Press, announces to us that, although no politician, he is a candidate for engrossing clerk of the next State Assembly. Removal. The entire business office of the Scrmntric Press, Pacrrio Rurau Press, and onr U. S. and Foreign Patenr AcENnoy and EineRavinG establishment, has been removed to No. 338 Montgomery street, on the southeast corner of California street, diagonally opposite Wells, Fargo & Co.’s. ComBInaTIon GRAIN HarvesTeR.—B. F. Cook, of Napa, the inventor of several interesting machines, (someof which have been patented) has combined a Haines’ header with a Pitts’ thresher, and a portable threshing engine, whereby he cuts the grain in the field, threshes, cleans and sacks itin one operation. His model at the State Fair showed the plausibility of his plan in theory. He adjusts the machinery so that all the work of cutting, threshing and cleaning can be done by the power of the engine if desired, so as to leave no work for the teams, but to draw the machine. He has an ingenious method of leveling parts of the machine, whereby the engine and bviler cau be kept constantly level over uneven or sideling ground. Working experiments in the field have conviuced Mr. C. that his machine is practical, and we hope we will find ample means to help him demonstrate most speedily its value. His machine is calculated to cut 18 feet wido. © ApouT THE Loss OF QUICKSILVE RB.’ The communication under the above title, which appears on the third page of the present issue, found its way there through inadvertence. The writer evidently misunderstands both the nature of the’ information asked for by Mr. Panl, and the object in seeking that information; and we presume no miner will be so misled as to suppose that Mr. P. has any other object in view in seeking for the information than the general benefit of the miners themselves. Tur Gonpen Stare Iron Works(co-operative)are putting up a number of Stevenson’s mouldboard paus ‘of a large size, and some eight-foot settlers, for the Metropolitan Mill and Mining Co., Eureka, Nevada. They are also making some large hydraulic and scrow presses for the viueyards of Eberhardt and Lachman. The castings and condensers forthe Kuox and Osborne’s Patent Furnace for the Pheenix Quicksilver Mine in Pope Valley, Napa Co., are under way. ‘The men are also at work on large quantities of White and Grey Iron }castings for stamp aud pan shoes and dies. TInrortant Water Surr.—A suit involying the title to certain water privileges, was decided last week by Judge Field. The action was brought by the City of Gold Hill Water Co. to enjoin the Cole §S. M. Co. from certain water privileges. A temporary injunction was allowed by the United States Cireuit Court. The case was subsequently heard by J udge Field, Associate Justice of the U.S. Supreme Court, who made an order dissolving the injunction, leaving the Cole S. M. Co. in possession of their privileges. State Fair Gold Medals, By an advertisement in Ruran Press it will be seen that all claimants to the State Agricultural Society’s Gold Meadals are required to furnish statements relative to the manufacture or production of the articles exhibited, and on which they claim the award of the medal, or npon which they base their claim of merit. Tus San Francisco Guass Works, situated on King street near Fourth, in this city, commenced operations again on the 12th inst. Mr. Newman, who is in charge, informs us that everything is now in readi ness for orders in this line. Avertnu’s Caemican Paryt.—An advertisement of this valuable product will be found in another column. This is the same paint of which we gave a lengthy description in our last week’s issue, Complete Volumes of the Scientific Pre irom January, 1864, can be had at this office at $3 Gee Xqiume: Bound in cloth, $5. A limited number only on hand. CouGHs.—THE ADMINISTRATION OF MepieraL Prep. arations in the form of a lozenge is of all modes ths most eligible and convenient, more especially as regards “Brown's Bronchial Troches," or Cough Lozenges, allay irritation which induces cough. ing, giving instant relief in Bronchitls, Hoarseness, In. a CoucH Rrmepy. fluenza, and Consumptive and Asthmatic complaints. Opera Glasses, ‘Pebble Spectacles, and Eyeglasses, in great variety. wholesale and retnil. CG MULLER, Optician, 205 Montgomery street, Russ Block, San Francisco, Tv23-3m. Scientific and Practical BOOKS os MINING, METALLURGY, ETC. BY GUIDO KUSTEL MINING ENGINEER AND METALLuRGIsT. Published and Sold by DEWEY & CO. Roasting of Gold and Silver Ores, and the Extraction of their Respective Metals without Quick. silver. 1870. This rare book on the treatment of gold and silver ores without quicksilver, is liberally illustrated and crammed full of facts. It gives short and concise descriptions of various processes and apparatus employed in this country and in Europe, and explains the why and wherefore. It contains 142 pages, embracing illustrations of furnaces, implements and workiug apparatus. It isa work of great merit, by an author whose reputation is unsurpassed in his speciality. Price $2.50 coin, or $3 currency, postage free. Concentration of Ores (of all kinds), ineluding the Chlorination Process for Gold-bearing Sulphurets, Arseniurets, and Gold and Silver Ores generally, with 120 Lithographle Diagrams, 1867. This work is unequaled by any other published, embracing the subjects treated. Its authority is highly estecmced and regarded by its readers; containing, as it does, much essential information to the Miner, Millman, Mctallurgist, and other professional workers in ores and minerals, which cannot he fonnd elsewhere in print, It also abounds throughout with facts and instructions rendered valuable by heing clearly rendered together and insimple order. It contains 120 diagrams, illustrating machinery, etc., which alone are of the greatest value. Price, $7.50, postage paid., = Nevada and California Processes of Silver and Gold Extraction, for general use, and especially for the Mining Public of California and Nevada, with full e: ions and directi for all metallurgical operations connected with silver and gold from a prelimlnary examinatlon of the ore to the final castlng of the ingot. Also,a description of the general metallurgy of silver ores. 1864. As its title indicates, this work gives a wide range of information, applicable to all vein miners and workers in precious metals, affording hints and assistance of excccding value to hoth the moderately informed and the most expert operator. Price, $5in cloth; $6 ln lesther—coin. For single copies of the ahove works, or for the trade, address DEWEY & CoO., Publishers and Patent Agents, Scientific Press Office San Frandisco. Phelps’ Patent Animal Tran, a ee = FOR GOPHERS, SQIRRELS, RATS, CAYOTES, a and other ‘’ Varmints.” This Trap, as may be seen, is of simple construction, and not likely to get out of order, and very durable. It is Very Efficient and can he used conveniently by women or children. THE OHEAPEST AND BEST YET INVENTED. Price 50 cents. By mail, prepaid (to places where express charges are high), $1. A liheral discount to clubs or dealers who buy by the dozen. Address the inventor and manufacturer, D.N. PHELPS, * al-ly-awhp San Leandro, Alamedz County, Cal. OPAL GAS GLOBES. An Entirely New Article, with Patent Doubie Burner. For Softness and Brilliancy of Light it has no equal. For Sale hy THOMAS DAY, 732 Montgomery street and 335 Plne strect, 4.51 ocl San FRANcisco. BETTS’S CAPSULE PATENTS. To prevent INFRINGEMENTS, NOTICE IS HEREBY GIVEN, that BETTS'S NAME is ON EVERY OAPSULE he makes for the principal merchants in England and ¥rance, thus enabling vendor, purchaser, and consumer, not only to identify the ennineness of the Capsule, but likewise the contents of the vessel to which it is applied. The Lord Chancellor, in his indement, said that the Capsnles are not used merely for the pnrpose of the ornament but that they are perigee in protecting the wine from injury, and insuring its genuineness. Max BACTORIAS:—1, WHARF ROAD, CITY ROAD, MLONDON. AND BORDEAUX, FRANCE. J. M. STOCKMAM, Manufacturer of PATTERNS AND MODELS. (Over W. T. Garratt's Brass Foundry). Entrance, No. 129 Fremont street, San Francisco. &y23-3m