Black and white photograph of a large horizontal cylindrical metal storage container. "Smith Mfg. Co." is labeled on the container. Picture is set indoors.
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.
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...
