Steam engine‍

‍‍Mech­a­nism is stored in the Museum of the His­tory of Bau­man Moscow State Tech­ni­cal Uni­ver­sity (Moscow, Rus­sia).

‍‍Par­al­lel­o­gram.

M. Venet­skij. Tcheby­shev’s par­al­lel­o­gram // Morskoj sbornik (Naval Review). 1871. № 3. P. 5. (Russ­ian)

‍‍Geo­met­ric 3D model by Math­e­mat­i­cal Etudes.