B&W photograph of a long horizontal cutting machine on a stand, in front of a white backdrop. Picture shot indoors. Machine made by Rimple Manufacturing Co.
Black and white photograph of a large horizontal cylindrical metal storage container. "Smith Mfg. Co." is labeled on the container. Picture is set indoors.
Crova's apparatus was designed for the purpose of representing vibratory movements on the screen, with 8 disks. Turning the crank past a vertical slit caused the disks to rotate, while a beam of light from the optical system impinged on the slit...
