DescriptionB&W image of Walnut shutter. The shutter is mounter in a large metal circular box. There is a moror to the rear with also a box with two switches and a large dial with knob. Two electrical clips are attached to a relal and two more attached further back on the bed of device.
Verso: Red stamp: "Date 3/17/60 Negative No 2457; Title Walnut Test Shutter; Project or Department No 939
Authorized by Austin Higginson IBM Research Department No 508 "