F.F. # found stamped between the two tubes and handwritten in red on a white paper label on the front of the module. This number is also printed between the tubes.
Printed at the top of the chassis in the corner.
overall: 9 1/4 in x 5 1/4 in x 1 1/2 in
The record contains a Whirlwind I module with two vacuum tubes attached to a chassis. The chassis has a handle at the top. At the bottom of the module there is a male connector. On either side of the chassis are two metal screws. Contained within the chassis are six phenolic boards with various components soldered on.