Accumulator Decade Plug

This is the primary computing element from the ENIAC. There is an interesting description of Pres' effort to design this modular component in Scott McCartney's book ENIAC: The Triumphs and Tragedies of the Worlds First Computer. The "ring counter", as it's also known, being offered for sale was used in the famous Honeywell vs. Sperry patent trial. Included in the auction is an original blue line drawing of the plug-in unit with changes hand-marked on it in. Here are some details from from the ring counter:

Here I am holding the ring counter. I had to get a photo of me with it before I packed it up and shipped it to Boston for the sale;