Chevrolet CGT - What is this?

[Walde Libera]

Bob

I measured the box holder above the window frame, it is roughly 30" wide inside by about 2" wide and 2" deep. This box is welded to the top of the window frame above the wiper motor, the open side faces to the rear. The distance from the holder to the 2-hold down clamps is @19 ".

I didn't measure how far the clamps are apart.

I think the larger plotting board is 30" X 30"?

My CGT is currently residing in a museum so I don't have a picture available. In a couple weeks I'll get a good picture.

PS
On another note I have a picture of the other holder that is apparently for the tri-pod. This is from another CGT owned by the Elliot brothers of Newtonville.

Walde