whereupon the spring throws up the game board room so that no ray of white light may fall upon the and exposes the cavity J. plate, one must move with utmost caution under the dim red light to avoid upsetting and spilling the de- A SAFETY CATCH FOR ELEVATORS. veloping and fixing solutions. A very… … pended from a pair of trolley wheels adapted to travel the light, a strip of glass is cemented over the lower SAFETY CATCH FOR ELEVATORS. ) 1903 SCIENTIFIC AMERICAN, INC.
Machine · Motor · Device · Horse power · Scientific American · Safety catch · North pacific · Pole piece · Game board · Wireless telegraph · Steam turbine · Pounds pressure · Trade catalogs
Internet Archive · Public domain (published before 1931). Free to use for anything.
