Scientific American. 399 November 27, 1909. CHEMISTRY OF SOLDERING AGENTS. (Concluded from page 389.) > … less than 1/250 inch in diameter were TOGRAPHIC AND MICRO-PHOTOGRAPHIC APPARATUS is simply explained in Scientific soldered together and the junctions were Peary's American Supplement 1574. covered thickly with the zinc chloride A SIMPLE CAMERA-SHUTTER MADE OUT OF A PASTEBOARD BOX, PINS, AND A…
