he frame, as shown in Fig. 5. to print from ; but quite recently this objection has HOLDEB. The curved slotted spring catches at the top, when been overcome by the production of a specially pre- pushed outward ; slip over a pin on the end of the pared film, which may be readily separated from its… … either a roll holder or a plate holder is employed, a re- If the operator does not wish to draw upon zinc, Fig, 4.-THE ADJUSTABLE OBOUKD GLASS. versible back, enabling the operator to take pictures the design can be traced upon paper with a salt of upright or horizontally, and a special…
Patents · Railroad · Machine · Patented · Scientific American · Phonograph · Perspective view · Hot water · Electric light · Ground glass · American railroad · Sturtevant mill · Sewing machine · War ship · Floor plans
Internet Archive · Public domain (published before 1931). Free to use for anything.
