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Scientific American, Vol. 97, No. 5 (August 1907) (1907)

leaf 19

An illustration from Scientific American, Vol. 97, No. 5 (August 1907), 1907, leaf 19
ec- l)Oo klrt sent upon request. „ „ , troscopeeforColleKeaand Iron and Steel Laboratories. The Opaque Projec or for sbowinf? cuts and opaque obicota on the screen. Wireless. TeleKraPh Bausch & Lomb Optical Company, Rochester, N. Y. Outfits for Schooland oxiKirinitJEitut work. '* Photoscript " the… … perfect automobile lubricant—is the only Pettyjohn Machine oil that makes smooth, easy running abso- The importance of accurate adjustment cannot be too strongly for «C^^ 25 and lutely certain. There is a grade of emphasized. A watch may be made of the finest materials by the only W^^-^ up. most…

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