Barrel-form machine with meshing wheels m n
Each cap carries a wheel like m n, and each wheel turns the next
A perspective sketch of a large barrel-shaped or vaulted mechanism set in a frame, with a long shaft running out to the left that ends in an oval ring. Toothed gear-wheels and pegged spindles are drawn at the base of the drum. The caption explains that every 'berretta' (cap) carries a wheel like the wheel m n, so that each wheel turns the next in the train.
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A train of meshing wheels driven cap by cap
The note states that every cap has a wheel similar to the wheel m n, and that one turns the other. This describes a geared drive in which identical wheels mesh so that motion passes from one to the next. The toothed wheels and spindles sketched at the base of the drum correspond to this arrangement.