When I first saw this I thought it was some kind of early fax machine where results of the calculation could be transmitted over the phone. But it appears to be a multiplying calculator. The dial evidently controls how a number is multiplied. 

N.O.W.

Thanks so much for clarifying that for me...I appreciate your posted info and link.  Had no idea Everest made things other than typewriters.

Yes...and his presentation style is very calm and enjoyable to watch.