Justinian Caire,

Importer and Dealer in

Assayers' Materials & Chemicals

Mill Supplies Of Every Kind.

Brass and Steel Battery Screens,

Agency of L. Oertling's, London; Beckers' & Sons, New York,

Assay and Bullion Balances.

Opera, Field, and Marine Glasses; Optical Goods; Aneroid and Altitude pocket Barometers; Miners' Compasses of all kinds, etc., etc.

Makes a Specialty of everything required for Chlorination Works,

521 & 523 Market St., and 16 to 22 Stevenson Street,

San Francisco, Cal.

Catalogues And Price Lists On Application.

$1,000 Challenge Ore-Feeder,

For Quartz Mills.

Over 600 now in use, giving entire satisfaction. Awarded First Premium at the Tenth and Twelfth Industrial Fairs of the Mechanics' Institute. 20 per ceut. more ore crushed with 15 per cent. less wear of iron than by hand feeding.

Remarks On Furnaces 23

The above cut illustrates the recently introduced Grip, and also the Spring Attachment, which replaces the Weight heretofore used, and which is an obvious improvement. It is now fully demonstrated, after careful and long-continued experimentation and practical use, that the plan upon which a perfect Ore-Feeder must be constructed is that of a carrier, and not that of a shakng table. Uniform and accurate feeding is not possible on the latter plan. The ore must be evenly carried, upon a steadily advancing plane or table, to the line of discharge, and there simply dropped. Jerky or spasmodic contrivances will not answer the purpose for wet, sticky ores.

Improved Amalgamator & Concentrator

Over 700 have been put in use.

Remarks On Furnaces 24

The principle upon which Hendy's Patent Concentrator is constructed is the only true and mechanical one for the purposes of concentration. Centrifugal Force And Gravitation, combined as they are in this machine, cannot fail to accomplish the object sought.

Many certificates from proprietors of mills, who have this Concentrator in use, can be had, if required, giving the most flattering accounts of its efficiency. A most substantial evidence of its worth is the fact that the proprietor is receiving repeated orders from those who are using them, and have tested their merits.

The proprietor has recently still further improved the machine, making it stronger and still more durable. He flatters himself that the added advantages leave nothing to be desired as to the perfection of the Machine. Endorsed by the following Mining Companies: Grover M. Co., Bunker Hill M. Co., Crown Point M. Co., Keystone Cons. M. Co., Amador Co.,Cal. Plumas Eureka M. Co., Plumas Co., Cal., and very many others.

"The $1,000 Challenge"

Ore Concentrator.

The Frue Ore Concentrator, Or, Vanning Machine.

The Frue Ore Concentrator, Or, Vanning Machine.

Over 250 are now in use, giving entire satisfaction. Awarded First Premium and Silver Medal at the Industrial Fair for 1880, of the Mechanics' Institute, of San Francisco, Cal.

Saves from 50 to 100 per cent. more than any other Concentrator in use; and the concentrations are clean from the first working.

The wear and tear is merely nominal; the water required is less than in any other wet concentrator; the power required per machine is less than one-half horse power; the labor required is light, and one man on a watch can attend to sixteen machines.

We challenge any other Concentrator in use for a fair and impartial competitive trial, side by side, for stakes $1,000 each, and we mean business.

Adams & Carter, Agents,

Room 7, 109 California St., San Francisco.

(Sole Agents For The Colman Tappet.)

Remarks On Furnaces 26

Assay Office and Chemical Laboratory,

Bullion and Melting Rooms,

524 Sacramento Street, - San Francisco.

Careful Analyses made of Ores, Metals, Soils, Waters, Industrial Products, Foods, Medicines and Poisons.

Consultations on Cbemical, Mining and Metallurgical Questions.

Charges:

Assays.

Gold and Silver................$3 00

Gold, Silver and Lead......... 5 00

Gold, Silver and Copper........ 5 00

Copper........................ 3 00

Iron.......................... 3 00

Tin......................... 5 00

Quicksilver................... 5 00

Manganese.................. 5 00

Chromium.................... 5 00

Analyses.

Qualitative Analysis of Ores $10 00 to $25 00 Qantitative Analysis of Ores $15 00 to $50 00 Qualitative Analysis of Water.. 25 00 Quantitative " " ... 75 00

Guano.. 25 00 Proximate Analysis of Coal.... 10 00 Quantitative Analysis of Coal.. 50 00

Complete Analyses, qualitative and quantitative, of complex substances at special rates.

Deposits of Bullion Melted and Coin Returns made in 24 hours.

Deposits may be forwarded to this office from any part of the interior by express, and returns made in the same manner, either by check or certificate of Deposit.

Charges:

Gold Bars, on all amounts below 8500___$1 00

" " on all amounts from $500 to $1,600.............................. 2 00

Gold Bars, on all amounts above $1,600. 1/8 of 1 %

Silver Bars, on all amounts below $400___2 00

" " on all amounts above $400. 1/2 of 1 %

Dore Bars for the Gold..................$2 00

" " for the Silver..............1/2 of 1 %

Determination of Gold and Silver in any Alloy..............................2 00

Consignments of all kinds of ore received, and prompt cash returns made.