Plain Jane drawing ? Not if you zoom in on the drawing and look closely at what appears to be “U-shaped black lines on the gondola sides. Notice also the detail of the “square” bolt heads shown near the chain images. This level of detail adds nothing to the basic purpose of any shop drawing: to communicate to the shop personnel the Designers intentions. This is my “modern” utilitarian viewpoint speaking ,As I catalog each drawing, one of the pieces of information I record is the Draftsmen’s initials, usually at either of the bottom corners of the drawing. In order to do so, I zoom in  on the drawing. By this chance, I observed this amazing level of detail. There are sixteen “pictures” of chains, each one different, all rendered in  ink with small details shown. I stand in awe  of the talent and skill of these long-departed Draftsmen!