Scientific American Volume 59 Number 23 (December 1888) . . HOW TO MAKE AN INCUBATOR.— P*ull directions, illustrated with 7 flirures. Also direc-tions for operating the apparatus. Contained inSciioNTi FLO American Supplkmbnt, No. ttl !i. IricelOcents. To be had at this ofBce and from all newsdealers. w ATCHMAKER Send for BEDVCED PRICE LIST of,W liircoinb , date of July 1, Watch Tool Co., Waltham, Mass. s ?SEVERN AND MERSEY TUNNELS.— Full description of these two Important engineeringworks, with two engravings. Contained in Scientific AAfERICAN StTPPLhlMENT, NO. 604. Pr
Scientific American Volume 59 Number 23 (December 1888) . . HOW TO MAKE AN INCUBATOR.— P*ull directions, illustrated with 7 flirures. Also direc-tions for operating the apparatus. Contained inSciioNTi FLO American Supplkmbnt, No. ttl !i. IricelOcents. To be had at this ofBce and from all newsdealers. w ATCHMAKER Send for BEDVCED PRICE LIST of,W liircoinb , date of July 1, Watch Tool Co., Waltham, Mass. s ?SEVERN AND MERSEY TUNNELS.— Full description of these two Important engineeringworks, with two engravings. Contained in Scientific AAfERICAN StTPPLhlMENT, NO. 604. PriCO lO CCnts. TO be had at this office and from all newsdealers. To Electro-Platers. T>iE yipTo^R qy„NAMj; . J,PLATINC MACHINES rbree sizes, |30, $60, and $90. All Batteries and mate-rial tor Gold, Silver, and Nickel Plating. THOMAS HALL, 19 Bromfleld Boston, lor Illustrated Catalogue. FIFTY YEARS PROGRESS IN TELE- graphy.—ByW. H. Preece, An interesting bis-toncal paper. Improvements in apparatus. Tele-phones, Pneumatic t
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