ESTABLISHED 1820. YOUNG & SONS, 43 North Seventh Street, Philadelphia, ASTRONOMICAL AND ENGINEERING INSTRUMENT MAKERS Young & Sons possess the only line of Graduating Engines in America capable of the finer graduations. Engineers and others invited to call. PATENT TRANSITS, PATENT LEVELS, PATENT SOLAR TRANSITS. may '81 ly Manuals and Catalogues on application. RONEY & HOCH, 7 Engineers and Architects, FRANKLIN INSTITUTE BUILDING, 15 & 17 S. SEVENTH ST., PHILA., PA. Designs and Estimates for BUILDINGS, RAILWAYS, etc. THE J. MORTON POOLE CO., WILMINGTON, DELAWARE, MANUFACTURERS OF Patent Ground Chilled Rolls. GRINDING MACHINERY, Adapted to the wants of Rolling Mills, Calendering Works, Paper Mills, etc., or for Feb. '81, ly LIGHT SOLAR TRANSIT. -ΦΟΥ, Ν. Υ. Special Purposes. ESTABLISHED 1845. W. & L. E. GURLEY TROY, N. Y. MANUFACTURERS OF CIVIL ENGINEERS' -AND SURVEYORS' INSTRUMENTS. Full illustrated Price List, with description of latest improvements, sent on :pplication. mar '8 ly The James Smith Woolen Machinery Co. Works, 411 to 421 Race St., Philadelphia, Pa. WOOLEN MACHINERY, INCLUDING MACHINERY FOR THE PREPARATION OF WOOL. ALSO CARD CLOTHING OF EVERY DESCRIPTION. June, '81, 1 year. Send for Illustrated Circulars. “ J. L. SMITH, MAP PUBLISHER. LARGEST ASSORTMENT OF Maps, Atlases, Globes, Spring Map Rollers, Map Cases, ALL KINDS OF Drawing Papers, Linen, etc. No. 27 S. 6th St., Phila., Pa. may '81 6m W. C. ALLISON & CO. THIRTY-SECOND AND WALNUT STREETS, PHILAD'A, MANUFACTURERS OF ALL KINDS OF WROUGHT AND CAST IRON WORK -FOR CARS, BUILDINGS AND BRIDGES. Every description of Railroad Cars, Bolts, Nuts and Washers. Also Manufacture, from the Best Quality of Iron, Gas, Steam and Water Pipes, Tubing for Oil, Salt and IRON AND STEEL LAP-WELDED BOILER TUBES. LOCOMOTIVE BOILER TUBES A SPECIALTY. apl, 81.-1 y. ESTABLISHED 1846. Philadelphia Scale & Testing Machine Works. RIEHLE BRO'S, MANUFACTURERS OF Scales and Testing Machines Of all capacities and descriptions. Sealed to the standards of all Nations. HOTELS AND BUSINESS HOUSES. HYDRAULIC AND STEAM POWER. Hoisting Machinery for Iron Furnaces, Mines, Inclined Planes. Portable Hoists, and all kinds of Hoisting Machinery a specialty. apl '81.-1 y. STOKES & PARRISH. 30th and Chestnut Streets WANTED. The following numbers of the JOURNAL OF THE FRANKLIN INSTITUTE. A liberal price will be paid for any of them, viz.: S. LLOYD WIEGAND, MECHANICAL ENGINEER Expert in Patent Causes. No. 144 SOUTH SIXTH ST. Feb '81, 1v Philadelphia, Pa., U. S. THE BEST STEAM PUMP IN AMERICA. All Sizes and for Every Possible Duty. THE DEANE The peculiar excellence of the Deane Steam Pump consists, First, in the unequaled simplicity of its mechanism. Its valve gear consists of fewer pieces than are found in any other pump. All the parts move on parallel lines and central to the same vertical plane, so that all levers, connecting rods, rocker arms, springs, adjustable screws and other mechanical complications are avoided. Both the Main Valve and the Supplemental Valve are Flat Slide Valves, readily understood and easily reseated in case of wear. The Supplemental Piston is in one piece, and it is a piston, not a valve. Second, in the certainty of its action. The Supplemental Piston, which has a Compensating Steam Jacket, is driven by the direct pressure of steam on alternate ends, complemented, when necessary, by the whole power of the main engine, so that it runs equally well vertically or horizontally, exhausting into open air or into a condenser. The mechanical connection renders it absolutely certain that the valve shall always lead the piston, so that there is no possibility of any pounding on the cylinder heads, and the clearance in the cylinder is reduced to the minimum. The machine, simple, yet lacking nothing essential to a perfect pump, is always ready and in position to start at any point in its stroke, on the admission of water, air or steam, and to run at any speed desired, either the fastest or the slowest. -MANUFACTURED BY THE DEANE STEAM PUMP COMPANY OFFICE & WORKS, HOLYOKE, MASS. WAREHOUSES { 92 and 94 Liberty Street, New York. 7 Oliver Street, Boston. SEND FOR NEW ILLUSTRATED CATALOGUE. PHILADELPHIA AGENT, W. N. GOURLAY, No. 43 SOUTH FOURTH STREET. |