=Absolutely Fire Proof. BRAIDED PACKING, MILL BOARD, SHEATHING, CEMENT, FIBRE AND SPECIALTIES. CHALMERS-SPENCE CO., FOOT E. 8TH ST., N. Y.= SHIELDS & BROWN Manufacturers and Sole Proprietors of [Illustration: BRADLEY'S INSULATED AIR COVERINGS] =For BOILERS and STEAM PIPES Reduces Condensation of Steam.= FOR GAS AND WATER PIPES. =Prevents Sweating and Freezing.= =The Best Non-Conductor of Heat and Cold in the World= Send for illustrated descriptive Circular, and name this paper. =143 Worth Street, New York. 78 and 80 Lake Street, Chicago.= VIOLIN OUTFITS. Consisting of Violin Box, Bow, and Teacher, sent to any part of the United States on 1 to 3 days' trial before buying. [Illustration] =Violin Outfits at $4, $8, $15 and $25 each. Send Stamp for= Beautiful Illustrated 96-page Catalogue of Violins, Guitars, Banjos, Cornets, Flutes, Strings, etc. Lowest prices. Mail orders a specialty. =C. W. STORY, 26 Central Street, Boston, Mass.= ICE HOUSE AND COLD ROOM.--BY R. G. Hatfield. With directions for construction. Four engravings. Contained in SCIENTIFIC AMERICAN SUPPLEMENT, =59.= Price 10 cents. To be had at this office and of all newsdealers. HARTFORD STEAM BOILER HARTFORD. CONN. INSPECTION AND INSURANCE CO. OPERA GLASSES _Microscopes, Telescopes, Spectacles, Barometers, Thermometers, Photographic Outfits for Amateurs,_ =W. H. WALMSLEY & CO.= successors to R. & J. Beck, Philadelphia. Illus. Price List free to any address. [Illustration] Bibb's Celebrated Original BALTIMORE FIRE-PLACE HEATERS, To warm upper and lower rooms. The handsomest, most economical Coal Stoves in the world. =B.C. BIBB & SON= Foundry Office and Salesrooms, 39 and 41 Light Street, Baltimore, Md. MARBELIZED SLATE MANTELS. [Illustration] _Send for Circulars._ THE BOOMER & BOSCHERT PRESSES. [Illustration: Lard Press.] [Illustration: Baling Press.] [Illustration: Oil Press.] [Illustration: Cider Press.] [Illustration: Baling Press.] We make a great variety of Presses, with powers from 50 to 700 tons, with movement of platens from one inch to six feet or more, to work by hand or power, and at any speed required. Send for catalogue. BOOMER & BOSCHERT PRESS CO. 155 WEST WATER STREET, SYRACUSE, N. Y., U. S. A. THE AMERICAN BELL TELEPHONE CO. 95 MILK ST., BOSTON, MASS. This Company owns the Letters Patent granted to Alexander Graham Bell, March 7th, 1876, No. 174,465, and January 30th, 1877, No. 186,787. The transmission of Speech by all known forms of Electric Speaking Telephones infringes the right secured to this Company by the above patents, and renders each individual user of telephones not furnished by it or its licensees responsible for such unlawful use, and all the consequences thereof, and liable to suit therefor. [Illustration: Gap Lathe, $125.] SHEPARD'S NEW $60 Screw-Cutting Foot Lathe.