Volume 13 (1866) (424 pages)

168 She Mining and Sclentific Press. Mining aul Seientific Press. W. B. EWER,.ccccccusceceestenseneeesrssees Szn1or EpiTor. GO. W. M. SNITH. W. B. BWER. A. T. DEWEY. DEWEY & CO., Publishers. Orricz—No. 505 Clay street, corner of Sansome, 2d floor. Terms of Subscription: One copy, per annum, in advance,. One copy, six months, in advance, . ves kay For sale by Carriers and Newsdealers. «28 Canvassing Agents. ~ Qur Frrenps ean do much In aid of our paper and the cause of practical knowledge and selence, by assisting our Agents In their labors of canvasslng, by lending their Infiuenee and enconraging favors. We shall send none but worthy men. r . s Storr Is Agent forthe Mining awn Screnia hae Nevada, and will canvass the principal citics, towns and districts of that State. August 25, 1866, vr. O. P. Trueadell will act as our Corresponding Agent and Solicitor. in the interior of this State, frem this date, Angust 25, 1866. . Mr, A. ©. Knox, fs our city soliciting and eollecting Agent, and all subscriptions, or other favors extended to hin, will be duly acknowledged at this office. San Francisco, Jan lith, 1866. Mr. ¥. N. Hudson, is authorized to solicit snbscrip tlons, advertising, cte., for the Minino anv Scientinic Psxss, in San Francisco, and to recelpt tor the same. Sopscrmers who do not receive the MinInG AND Scieytiric Press in due time, are requested to inform the publishers. San E'rancisco: Saturday Morning, Sept. 15, 1866. THE RYERSON PROCESS, The Ryerson process, for which the New York ogent of the Mariposa estate has claimed such marvellous results in its opplication to some of the ores of the Josephine mins, was introduced into this State by the inventor some four years sgo. If ws mistake not, ths machine was first put into operation upon the Mariposa estate, where an unsuccessful nttempt was msds to work soms tailiogs which had been lying for some yenrs exposed to atmospheric influeness. The chief cause of the failure wss attrihuted at the time to certain cheinical changes, whicb, it was asserted, tha tailings had undergone, and whicb operated unfavorably on the quicksilver used for amnlgomotion. Ths true reason was, probably, due to a lack of a full understanding of the nature of the process. Two of the machines were subsequently put up in this city; the impression their working made upon the minds of qunrtz operators, may he inferred from the fact that several of the machines were soon after ordered for various parts of the Stste. Two of them were put up in Grass Valley, neither of which, however, run for any considerable length of time. The reason, therefor, we have understood, to he ths the very good one—the insufficient quantity of gold in the rock. Abont the snme time anotber mnchine was taken to San Bernardino county, where it was operated for a year or more with very fair results. Soon afterward, still another one was put up, if we mistake not, in Tuolumne county ; both the latter machines were set in operation under the direct supervision of the inventor, Professor Ryerson. Of all that have heen in operation, noae, uulcss we except the one last used on the Mariposs estate, are now in operation. Varions kinds of crushing apparatus have been attnched to these aiachines; any dascriptiou of which will answer, provided the crushing is done thoroughly and dry. The distinctive feature of the process, is the use of superheated steam, as an aid to amalgamotion. This is accomplished by first placing the crushed quartz in a kind of an upright stesm boiler, in the hottom of which is plsced a coil of perforated steam pipe, ivto which is conducted a flow of superheated steam, which is liberated in the midst of the quartz that overlays the coil. It is claimed thut the hot steam instantly vaporizes the qnicksilver, which as. cends to the top of the boiler where it meets a Surlace cooled by the applicatiou of cold water upon the outside, and by which it is condensed and falls to the bottom, to he again and again vaporized as hsfore. In the meantime the pulverized quartz in the hottom of the hoiler is kept iv a constant state of agitation hy the inrush of steam, nnd the guld more readily amalgamated by the vaporized quicksilver. Tbe time required for amalgomation is about twenty-five mioutas, nnd some 800 pounds are worked ata charge. By opening a man-hole in the bottom of the amalgamator, the quartz is pllowed to drop into any kind of a separator which msy be desired, when ths amolgam ond quicksilver is readily collected. The great desideratum for this process is to secure a fine and dry pulverization of the quartz: Several modes have been adopted, but that which would anpear ths most practicnble, is the use of stamps with a fan exhaust, by which tbs qunrtz is delivered in the shaps of an impalpnhle dust into a largs chamber, from whence it is removed, for treatment with the superheated steam. Ths great drawback to this process is the difficulty of ventilsting the chamber, or finding an escape lor the air witbout losing, nt the same time, a largs amount of the quartz dust. , Messrs. Rounds & Strong, of this city, hnve recently patented an ingenious device for remedving this trouble, which consists of a kind of douhls chamber, the inner one of which is intended to receive the escoping air, with its accompanying dust, through n norrow funnelshaped opening, into the throat of which is nt the sams time introduced a small jet of steam, by which the dust is saturated, and as the stenm is condensed by menns of a system of condensers, itis deposited in a receptacle nt the bottom of the chnmber, fiom which it is readily removed aod dried for treatment. This mode of crushing, we should think, is fnr nhend of that adopted at Mariposa, which, in our opinion, would he most applicable to very soft material;—it being first desigued for reducing chsrcoal for ths manufacture of gunpowder. Another expedient was adopted with considernble success at San Bernsrdino, which covsisted in placing a steep roof over the chamber, with low, hanging enves, spaces being left between the roof ond walls for the escaps of theair. The peculiar current formed in the chamber had n tendency to deposit the dust on the floor, with very little loss through the openings. We should he inclined to question the great dispority of yield between the old process ond Ryerson’s, as given in the Inte report of the New York agent of the Mnriposa estate ; yet, there can be but little doubt that better results have been obtained than hy the process heretofore adopted, from the fact that the superintendent has, within a few days, ordered two other machines for the Josephine miae, one of which will be run exclusively upoa tailings. Tbe bullets used in these machines are cast of white iron, and are made, with the cylinders, at the Golden State Iron works. " Manva or Buowrire Awatysis.—We hnve received from H. H. Bancroft & Co., a copy of *Elderhorst’e Manual of Blow-pipe Aaalysis and Determinative Mineralogy.” It is adapted to the use of the heginner; and seems to us to supply, in 2 compact form, all the information necessary for the performing of most operations for the determination of miverols, which is contained in more extensive and more elaborate works. ‘With this book, a hlow-pipe, ond a few pieces of borsx and other re-agents, one can test almost any piece of rock suffcieut to determine its coinposition. Ths present, which is the third edition, is mnde especinlly npplicnble to those species of minerals which occur on the American Continent, and contains one chapter which does not appear in former editions. AustTRALiA, for instance, where, necording to Mr. Hopkins, a distinguished mining engineer, the Black Hill Company, with a paid up capital of $120,000 coin, with quartz aver aging less than $2.25, coin, per ton, makes it pay 30 per cent. perannum on that capital! * * Truly we have muchto lesra from our Australian cousins. if they can do these things; and it is certainly incumbent upou the Government to send thither a competent person to ascertaia the truth, and give us the advautsge of his knowledge.— American Journal of Mining, N.Y. If our New York cotemporary will peruse the last issue of the Press, he will observe that Californians can mine ond mill similar rock tothatof the Black Hill mine for less thau $1 per ton. There are scores of mills in this State crushing hard ores at a running expense of less thaa $1.50 per tou. (Edltorlai Correspondence.) THIRTEENTH ANNUAL STATE FAIR. THE THREE FIRST DAYS. Yhe Fair hns now progressed through onehalf of its allotted time, snd notwitbstanding exhibitors hsvs been slow in coming forward with their articles, ths Pavilion is now very well filled; nearly fifty entries were msde yesterdny—the third doy of ths sxhibition. The city nod its hotels ars crowded witb strangers, who are still continuing to arrivs with every boat, trsin and stage. Ths San Francisco hoat of this morning brought up a very full load. The weather has thus far been unusunlly favorahle, and chcerfulness and viyacity everywhere prsvails. The attendnnce at the Pavilion is incrensiog with ench dny’s continunnce of tbe Fnir. be attendances, Inst evening, on the ocessiou of the Annual Address, was very large. Hundreds were in waiting outside befors ths doors were opened. The Hall was crowded, so nuch so that independent locomotion was rendered almost an impossibility— the ouly convenient progress being with the crowd, as it circulated rhout the hall in one dense mass of moving humonity. It is said to lave heen the largest attendance ever witnessed in this city, on nny similar occasion. All ths fashion nnd beauty of the metropolis were tbere, ond as the mass swept slowly nround the avenues, those who desired to listcn to the address, gradually drew out from the noviug crowd, aud filled the chairs which were nrranged in the vacant spocs about the spcoker’s stand. A little befors nine o,clock, the President of the Soviety, Chas. F'. Reed, Esq., with the other officers and their invited guest, Dr. D. J. Mncgowan, with the orator of the evening, filed slowly through the crowd until they reached the speaker’s stand, when the President, with a few brief words, introducad to the audience Joseph W. Winnns, Hsq., of San Francisco, who delivered the regular Anounl Address. The address was hnppily.conceived, eloquantly delivered, and received with most niorked nnd earnest attention. It appeors in full in the Union of this morning, and wil! doubtless be published in the Bulletin. It should barcad by every Californian, ond distributed far and wide among our friends at the Kast, as a trothful and eloquent exposition of the resources of our State, and the indomitable energy and enterprise of her pepulation. THE DISPLAY AT THE PAVILION, As we have alrendy intimated, is quite large and varied. The products of the soil, tbs mine, tbe forest, ths orchard and the vineyard, are here in great profusion. Ourmanufacturers are represented in tbeir abnndance and variety, and alinost everything which toil contributes within tha limits of our State, to the development and progress of the human race, appears to havea representative here. While, however, nenrly every department of industry is represented to soine extent, it is very much to be regretted that such exhihition is not more full and varied in the different classes. ‘T'be exhibition, as it is, furnishes the most nhuodnnt evidence, that with a little more effort on ths part of those most interested, it might easily have . been made vastly. more extensive and attractive. True, space under present arraugements might in such nn exigency have heen scarce ; but we presume the management would have been abundantly able to have provided for any possible contiugency that might have occurred. THE DISPLAY OF FRUIT Is the most prominent fentnre, and is nnusually large and varied, attracting much attention. Soma idea of this display may he inferred from the fact that one individual, J. R. Nickerson, of Lincoln, exhibits 265 varieties of apples alone, iu addition to 92 varieties of pears, 30 of peaches, 12 of quinces, 240 of grapes, besides figs, plums, dried fruit, raisins, preserves, etc. ‘I'hére are also seventeen otbsr exhibitors of fruit, aud ten of native wines. THE MINERAL EXHIBITION. The display of-minerals, so far as it goes, is very interesting ; but it is much short of whnt it should hnve been. Ths chief cabinet minerals are contributed by Dr. J. M. Frey, of Sacramento, who furvishes thirty-six beautiful specimens. J. Johnson, Jr., also of Sacramento, furnishes a very fine’ case of csbinst minerals. i Professor W. P. Blake, of San Francisco, furnishes a very neat display of sixteen specimens of crude nod refined petroleum, from different localities in California. Harkness & Co. exhibit massive specimens of silver ore from Blind Springs, Movo county, Californis. These inasses weigh in the aggregote four hundred pounds, and contain over $1,000 of silver to the ton, and twenty-five per cent. of copper. They form part of a shipment of three tons and on half which have just been sent to Swnnsea for reduction, to which plnce five previous shipments have been made. ., hese specimens will be eent to the Universal Exhibition nt Paris next year. The course of the vein whence they sre taksn is a little west of north and ths mine lying directly south of Aurors, the course of the vein would be a little east of Virginia City, Nevada. hs mineral exhibition, limited as it is, appears to form one of the most attrnctive features of the exhibition. MINING MACHINERY. Mining machinery, which should have occupied a lorgs space io the lower hall, is confined to the single exhibition of uns of Crall’s Waltzing Anialgamating Pans, combined with a grinder, sntered by ths Vulcan Foundry of San Francisco. The grinding of this pon is effected by a series of foar or mors grinders revolving sround a common ceoter, and at ths same tims upoo their own axes, and hence called a sun ond plonet notion. This doubls oction appenre to break up the rotsry motion, ~ which the pulp invariably receives in all other pans, more thaninsnyother in uss. It must also possess the additional advantage of con, stantly presenting new grinding surfaces to every port of both shoes and dies, thus avoiding the striated effect, in wenring upon pans which hnve a uniform revolving action constantly repeated over the same surfncs. We understand that this pan lms beeu for some time in successful operntion in San Juan, ond one or two other places in Nevada county. The pon now on exbibition is destined for a mill near Nevada, and the inventor also has an order for the introduction of his principle into twenty pans of other construction, now at work in a inill in Amador county. The revolving mullers can be easily substituted in any of the flat-bottom pans in use, and ata amallcost. A patent for this invention was recently obtained through the Mrnine anp Screntiric Press Parent AGEncy. AGRICULTORAL MACHINERY. The display’ of agricultural machinery is quite full; hut consists mostly of those of Eastern mnnufacture. Out of the great numher of agricultural inventions we notice only Mott’s Double Reversible Plow, Hill's Improved Seed Sower, Hattabough’s Hay Fork, exhihited in model only, a Grapa Crusher and Press comhined, and two of Robinson’s patent Fruit Gatherers. Instead of this_meager display of home ingenuity, the lower hall should have been entirely filled with California inven _ tions, to the exclusioa, if need he, of all im_ ported ones. We have no time in tbe present issue to notice the ahove, and one or two other Eastern inventions on exhibition. We sball eudeavor to do so next week. There will be a grand trial of agricultural implements across the rivar to-morrow, at which your correspondent will be present. OTHER NOTABLE EXSINITS. Among the other notable exhihits on exhihition, we have harely room to mention today the superb specimens of silkworms by L. Prevost, of San Jose ; samples of cotton manufacture, shceting and twine, from W. H. Rector of the Oakland mills, ete. Sream as Manvar Lanor.—At a late fire in London, it is said tbat the steam fire-engive, did as much work at a cost of abont $60, as would have cost $7,000 hy the old system of \monunl labor. ’

168 She Mining and Sclentific Press. Mining aul Seientific Press. W. B. EWER,..ccccccusceceestenseneeesrssees Szn1or EpiTor. GO. W. M. SNITH. W. B. BWER. A. T. DEWEY. DEWEY & CO., Publishers. Orricz—No. 505 Clay street, corner of Sansome, 2d floor. Terms of Subscription: One copy, per annum, in advance,. One copy, six months, in advance, . ves kay For sale by Carriers and Newsdealers. «28 Canvassing Agents. ~ Qur Frrenps ean do much In aid of our paper and the cause of practical knowledge and selence, by assisting our Agents In their labors of canvasslng, by lending their Infiuenee and enconraging favors. We shall send none but worthy men. r . s Storr Is Agent forthe Mining awn Screnia hae Nevada, and will canvass the principal citics, towns and districts of that State. August 25, 1866, vr. O. P. Trueadell will act as our Corresponding Agent and Solicitor. in the interior of this State, frem this date, Angust 25, 1866. . Mr, A. ©. Knox, fs our city soliciting and eollecting Agent, and all subscriptions, or other favors extended to hin, will be duly acknowledged at this office. San Francisco, Jan lith, 1866. Mr. ¥. N. Hudson, is authorized to solicit snbscrip tlons, advertising, cte., for the Minino anv Scientinic Psxss, in San Francisco, and to recelpt tor the same. Sopscrmers who do not receive the MinInG AND Scieytiric Press in due time, are requested to inform the publishers. San E'rancisco: Saturday Morning, Sept. 15, 1866. THE RYERSON PROCESS, The Ryerson process, for which the New York ogent of the Mariposa estate has claimed such marvellous results in its opplication to some of the ores of the Josephine mins, was introduced into this State by the inventor some four years sgo. If ws mistake not, ths machine was first put into operation upon the Mariposa estate, where an unsuccessful nttempt was msds to work soms tailiogs which had been lying for some yenrs exposed to atmospheric influeness. The chief cause of the failure wss attrihuted at the time to certain cheinical changes, whicb, it was asserted, tha tailings had undergone, and whicb operated unfavorably on the quicksilver used for amnlgomotion. Ths true reason was, probably, due to a lack of a full understanding of the nature of the process. Two of the machines were subsequently put up in this city; the impression their working made upon the minds of qunrtz operators, may he inferred from the fact that several of the machines were soon after ordered for various parts of the Stste. Two of them were put up in Grass Valley, neither of which, however, run for any considerable length of time. The reason, therefor, we have understood, to he ths the very good one—the insufficient quantity of gold in the rock. Abont the snme time anotber mnchine was taken to San Bernardino county, where it was operated for a year or more with very fair results. Soon afterward, still another one was put up, if we mistake not, in Tuolumne county ; both the latter machines were set in operation under the direct supervision of the inventor, Professor Ryerson. Of all that have heen in operation, noae, uulcss we except the one last used on the Mariposs estate, are now in operation. Varions kinds of crushing apparatus have been attnched to these aiachines; any dascriptiou of which will answer, provided the crushing is done thoroughly and dry. The distinctive feature of the process, is the use of superheated steam, as an aid to amalgamotion. This is accomplished by first placing the crushed quartz in a kind of an upright stesm boiler, in the hottom of which is plsced a coil of perforated steam pipe, ivto which is conducted a flow of superheated steam, which is liberated in the midst of the quartz that overlays the coil. It is claimed thut the hot steam instantly vaporizes the qnicksilver, which as. cends to the top of the boiler where it meets a Surlace cooled by the applicatiou of cold water upon the outside, and by which it is condensed and falls to the bottom, to he again and again vaporized as hsfore. In the meantime the pulverized quartz in the hottom of the hoiler is kept iv a constant state of agitation hy the inrush of steam, nnd the guld more readily amalgamated by the vaporized quicksilver. Tbe time required for amalgomation is about twenty-five mioutas, nnd some 800 pounds are worked ata charge. By opening a man-hole in the bottom of the amalgamator, the quartz is pllowed to drop into any kind of a separator which msy be desired, when ths amolgam ond quicksilver is readily collected. The great desideratum for this process is to secure a fine and dry pulverization of the quartz: Several modes have been adopted, but that which would anpear ths most practicnble, is the use of stamps with a fan exhaust, by which tbs qunrtz is delivered in the shaps of an impalpnhle dust into a largs chamber, from whence it is removed, for treatment with the superheated steam. Ths great drawback to this process is the difficulty of ventilsting the chamber, or finding an escape lor the air witbout losing, nt the same time, a largs amount of the quartz dust. , Messrs. Rounds & Strong, of this city, hnve recently patented an ingenious device for remedving this trouble, which consists of a kind of douhls chamber, the inner one of which is intended to receive the escoping air, with its accompanying dust, through n norrow funnelshaped opening, into the throat of which is nt the sams time introduced a small jet of steam, by which the dust is saturated, and as the stenm is condensed by menns of a system of condensers, itis deposited in a receptacle nt the bottom of the chnmber, fiom which it is readily removed aod dried for treatment. This mode of crushing, we should think, is fnr nhend of that adopted at Mariposa, which, in our opinion, would he most applicable to very soft material;—it being first desigued for reducing chsrcoal for ths manufacture of gunpowder. Another expedient was adopted with considernble success at San Bernsrdino, which covsisted in placing a steep roof over the chamber, with low, hanging enves, spaces being left between the roof ond walls for the escaps of theair. The peculiar current formed in the chamber had n tendency to deposit the dust on the floor, with very little loss through the openings. We should he inclined to question the great dispority of yield between the old process ond Ryerson’s, as given in the Inte report of the New York agent of the Mnriposa estate ; yet, there can be but little doubt that better results have been obtained than hy the process heretofore adopted, from the fact that the superintendent has, within a few days, ordered two other machines for the Josephine miae, one of which will be run exclusively upoa tailings. Tbe bullets used in these machines are cast of white iron, and are made, with the cylinders, at the Golden State Iron works. " Manva or Buowrire Awatysis.—We hnve received from H. H. Bancroft & Co., a copy of *Elderhorst’e Manual of Blow-pipe Aaalysis and Determinative Mineralogy.” It is adapted to the use of the heginner; and seems to us to supply, in 2 compact form, all the information necessary for the performing of most operations for the determination of miverols, which is contained in more extensive and more elaborate works. ‘With this book, a hlow-pipe, ond a few pieces of borsx and other re-agents, one can test almost any piece of rock suffcieut to determine its coinposition. Ths present, which is the third edition, is mnde especinlly npplicnble to those species of minerals which occur on the American Continent, and contains one chapter which does not appear in former editions. AustTRALiA, for instance, where, necording to Mr. Hopkins, a distinguished mining engineer, the Black Hill Company, with a paid up capital of $120,000 coin, with quartz aver aging less than $2.25, coin, per ton, makes it pay 30 per cent. perannum on that capital! * * Truly we have muchto lesra from our Australian cousins. if they can do these things; and it is certainly incumbent upou the Government to send thither a competent person to ascertaia the truth, and give us the advautsge of his knowledge.— American Journal of Mining, N.Y. If our New York cotemporary will peruse the last issue of the Press, he will observe

that Californians can mine ond mill similar rock tothatof the Black Hill mine for less thau $1 per ton. There are scores of mills in this State crushing hard ores at a running expense of less thaa $1.50 per tou. (Edltorlai Correspondence.) THIRTEENTH ANNUAL STATE FAIR. THE THREE FIRST DAYS. Yhe Fair hns now progressed through onehalf of its allotted time, snd notwitbstanding exhibitors hsvs been slow in coming forward with their articles, ths Pavilion is now very well filled; nearly fifty entries were msde yesterdny—the third doy of ths sxhibition. The city nod its hotels ars crowded witb strangers, who are still continuing to arrivs with every boat, trsin and stage. Ths San Francisco hoat of this morning brought up a very full load. The weather has thus far been unusunlly favorahle, and chcerfulness and viyacity everywhere prsvails. The attendnnce at the Pavilion is incrensiog with ench dny’s continunnce of tbe Fnir. be attendances, Inst evening, on the ocessiou of the Annual Address, was very large. Hundreds were in waiting outside befors ths doors were opened. The Hall was crowded, so nuch so that independent locomotion was rendered almost an impossibility— the ouly convenient progress being with the crowd, as it circulated rhout the hall in one dense mass of moving humonity. It is said to lave heen the largest attendance ever witnessed in this city, on nny similar occasion. All ths fashion nnd beauty of the metropolis were tbere, ond as the mass swept slowly nround the avenues, those who desired to listcn to the address, gradually drew out from the noviug crowd, aud filled the chairs which were nrranged in the vacant spocs about the spcoker’s stand. A little befors nine o,clock, the President of the Soviety, Chas. F'. Reed, Esq., with the other officers and their invited guest, Dr. D. J. Mncgowan, with the orator of the evening, filed slowly through the crowd until they reached the speaker’s stand, when the President, with a few brief words, introducad to the audience Joseph W. Winnns, Hsq., of San Francisco, who delivered the regular Anounl Address. The address was hnppily.conceived, eloquantly delivered, and received with most niorked nnd earnest attention. It appeors in full in the Union of this morning, and wil! doubtless be published in the Bulletin. It should barcad by every Californian, ond distributed far and wide among our friends at the Kast, as a trothful and eloquent exposition of the resources of our State, and the indomitable energy and enterprise of her pepulation. THE DISPLAY AT THE PAVILION, As we have alrendy intimated, is quite large and varied. The products of the soil, tbs mine, tbe forest, ths orchard and the vineyard, are here in great profusion. Ourmanufacturers are represented in tbeir abnndance and variety, and alinost everything which toil contributes within tha limits of our State, to the development and progress of the human race, appears to havea representative here. While, however, nenrly every department of industry is represented to soine extent, it is very much to be regretted that such exhihition is not more full and varied in the different classes. ‘T'be exhibition, as it is, furnishes the most nhuodnnt evidence, that with a little more effort on ths part of those most interested, it might easily have . been made vastly. more extensive and attractive. True, space under present arraugements might in such nn exigency have heen scarce ; but we presume the management would have been abundantly able to have provided for any possible contiugency that might have occurred. THE DISPLAY OF FRUIT Is the most prominent fentnre, and is nnusually large and varied, attracting much attention. Soma idea of this display may he inferred from the fact that one individual, J. R. Nickerson, of Lincoln, exhibits 265 varieties of apples alone, iu addition to 92 varieties of pears, 30 of peaches, 12 of quinces, 240 of grapes, besides figs, plums, dried fruit, raisins, preserves, etc. ‘I'hére are also seventeen otbsr exhibitors of fruit, aud ten of native wines. THE MINERAL EXHIBITION. The display of-minerals, so far as it goes, is very interesting ; but it is much short of whnt it should hnve been. Ths chief cabinet minerals are contributed by Dr. J. M. Frey, of Sacramento, who furvishes thirty-six beautiful specimens. J. Johnson, Jr., also of Sacramento, furnishes a very fine’ case of csbinst minerals. i Professor W. P. Blake, of San Francisco, furnishes a very neat display of sixteen specimens of crude nod refined petroleum, from different localities in California. Harkness & Co. exhibit massive specimens of silver ore from Blind Springs, Movo county, Californis. These inasses weigh in the aggregote four hundred pounds, and contain over $1,000 of silver to the ton, and twenty-five per cent. of copper. They form part of a shipment of three tons and on half which have just been sent to Swnnsea for reduction, to which plnce five previous shipments have been made. ., hese specimens will be eent to the Universal Exhibition nt Paris next year. The course of the vein whence they sre taksn is a little west of north and ths mine lying directly south of Aurors, the course of the vein would be a little east of Virginia City, Nevada. hs mineral exhibition, limited as it is, appears to form one of the most attrnctive features of the exhibition. MINING MACHINERY. Mining machinery, which should have occupied a lorgs space io the lower hall, is confined to the single exhibition of uns of Crall’s Waltzing Anialgamating Pans, combined with a grinder, sntered by ths Vulcan Foundry of San Francisco. The grinding of this pon is effected by a series of foar or mors grinders revolving sround a common ceoter, and at ths same tims upoo their own axes, and hence called a sun ond plonet notion. This doubls oction appenre to break up the rotsry motion, ~ which the pulp invariably receives in all other pans, more thaninsnyother in uss. It must also possess the additional advantage of con, stantly presenting new grinding surfaces to every port of both shoes and dies, thus avoiding the striated effect, in wenring upon pans which hnve a uniform revolving action constantly repeated over the same surfncs. We understand that this pan lms beeu for some time in successful operntion in San Juan, ond one or two other places in Nevada county. The pon now on exbibition is destined for a mill near Nevada, and the inventor also has an order for the introduction of his principle into twenty pans of other construction, now at work in a inill in Amador county. The revolving mullers can be easily substituted in any of the flat-bottom pans in use, and ata amallcost. A patent for this invention was recently obtained through the Mrnine anp Screntiric Press Parent AGEncy. AGRICULTORAL MACHINERY. The display’ of agricultural machinery is quite full; hut consists mostly of those of Eastern mnnufacture. Out of the great numher of agricultural inventions we notice only Mott’s Double Reversible Plow, Hill's Improved Seed Sower, Hattabough’s Hay Fork, exhihited in model only, a Grapa Crusher and Press comhined, and two of Robinson’s patent Fruit Gatherers. Instead of this_meager display of home ingenuity, the lower hall should have been entirely filled with California inven _ tions, to the exclusioa, if need he, of all im_ ported ones. We have no time in tbe present issue to notice the ahove, and one or two other Eastern inventions on exhibition. We sball eudeavor to do so next week. There will be a grand trial of agricultural implements across the rivar to-morrow, at which your correspondent will be present. OTHER NOTABLE EXSINITS. Among the other notable exhihits on exhihition, we have harely room to mention today the superb specimens of silkworms by L. Prevost, of San Jose ; samples of cotton manufacture, shceting and twine, from W. H. Rector of the Oakland mills, ete. Sream as Manvar Lanor.—At a late fire in London, it is said tbat the steam fire-engive, did as much work at a cost of abont $60, as would have cost $7,000 hy the old system of \monunl labor. ’