SPECIAL MACHINERY
For Grinding and Polishing
Manufactured by The Somersworth Machine Co.,
E. R. WARE, Agt.,
| 154 Lake Street, | CHICAGO. |
| Write for Circulars. | |
CALDWELLS CONVEYOR
CALDWELL'S SPIRAL STEEL CONVEYOR,
131-133 West Washington St., Chicago, Ill
ICE-BOATS—THEIR CONSTRUCTION and management. With working drawings, details, and directions in full. Four engravings, showing mode of construction. Views of the two fastest ice-sailing boats used on the Hudson river in winter. By H. A. Horsfall, M.E. Contained in Scientific American Supplement, 1. The same number also contains the rules and regulations for the formation of ice-boat clubs, the sailing and management of ice-boats. Price 10 cents.
CATALOGUES FREE TO ANY ADDRESS
TOOLS OF ALL KINDS
TOOLS GOODNOW & WIGHTMAN BOSTON
Smith Machine for making Thimbles or Sockets for Steam Boilers. Can make over 800 per day, all uniform in diameter and perfectly parallel, leaving no space for the bolts to bend in the thimble, making it almost impossible to make a tight boiler, for when the hydrostatic pressure is applied, straighten the bolt enough to make it leak; often has to be taken out. Address JAMES T SMITH, People's Machine & Boiler W'ks, Baltimore, Md
VENTILATION.—GREAT IMPORTance of ventilation. The vitiation of air that is constantly going on in inhabited places, exhaustion of oxygen by gas, candles and lamps. Ventilation by natural and artificial means. Contained in Scientific American Supplement, No. 525. Price 10 cents. To be had at this office and from all newsdealers.
A BIG OFFER. To introduce them, we will Give Away, 1,000 Self-Operating Washing Machines. If you want one send us your name, P. O. and express office at once. The National Co., 23 Dey St., N. Y.
VELOCITY OF ICE BOATS. A COLLECTION of interesting letters to the editor of the Scientific American on the question of the speed of ice boats, demonstrating how and why it is that these craft sail faster than the wind which propels them. Illustrated with 10 explanatory diagrams. Contained in Scientific American Supplement, No. 214. Price 10 cents. To be had at this office and from all newsdealers.
ELECTRICAL. Edward P.Thompson, Solicitor of Electrical Patents, 3 Beekman Street, N. Y. Write for testimonials and instructions.
CHLORINATION OF GOLD ORES.—A paper by G. W. Small, E.M., detailing the method of chlorinating gold adopted by the Plymouth Consolidated Gold Mining Co. Contained in Scientific American Supplement, No. 545. Price 10 cents. To be had at this office and from all newsdealers.
SEBASTIAN, MAY & CO'S
Improved Screw Cutting
LATHES Foot & Power
Drill Presses, Chucks, Drills, Dogs, and machinists' and amateurs' outfits. Lathes on trial, Catalogues mailed on application
165 W. 2d St., Cincinnati, O.
ST. PAUL
AND
NEWPORT IMPROVEMENT COMPANY.
CAPITAL $2,000,000.
THIS COMPANY OFFERS A BONUS AND LIBERAL INDUCEMENTS TO ANY MANUFACTURING CONCERN THAT WILL REMOVE THEIR PLANT TO ST. PAUL, MINN., OR START A NEW MANUFACTORY.
Correspondence Solicited. Address
FRED. S. BRYANT Sec'y,
ST. PAUL, MINN.
(Bank of Minnesota Building.)
Perfect small steam yachts. No smoke or noise. Simple and safe. Fuel, oil. 2 and 3 cylinder engines. Boats and canoes. Send stamp for either yacht or boat catalogue. Thos. Kane & Co., Chicago, Ill., and Racine, Wis.
MALLEABLE AND FINE GRAY IRON ALSO STEEL CASTINGS FROM SPECIAL PATTERNS FINE TINNING JAPANNING AND FINISHING. THOMAS DEVLIN & CO. LEHIGH AVE. & AMERICAN ST. PHILA.
SCIENTIFIC AMERICAN SUPPLEMENT. Any desired back number of the Scientific American Supplement can be had at this office for 10 cents. Also to be had of newsdealers in all parts of the country.
