figure 24.2
From Bromley, Allan, Ed.
Babbage’s Calculating Engines: A Collection of Papers by Henry Prevost Babbage
. Volume 2
. Los Angeles: Tomash, 1982.
From Bromley, Allan, Ed.Babbage’s Calculating Engines: A Collection of Papers by Henry Prevost Babbage. Volume 2
. Los Angeles: Tomash, 1982 Photograph by Doron Swade.