CMA Logo
Pic 1 Pic 2 Pic 3 Pic 4 Pic 5
Slide
  Home
About Us
Exhibits
From the Curator
FAQ
Hall of Fame
Hours
Membership
Slide Show


Now Available

IBM SPEAKERS BUREAU SLIDE SHOW

Slide 31
Thomas Stepped Drum Drawing

Courtesy: IBM Corporation

Thomas used the stepped drum principle of Leibniz. He also was the beneficiary of 150 years of growing industrialism - eliminating problems that had made the early machines so difficult to perfect. The stepped drum in Thomas Arithmometer was used in conjunction with a simple
system of counting gears and an automatic carry. The success of the machine was due to the many springs and other contrivances that destroyed the momentum of moving parts so they would not carry beyond their intended point - a frequent failing in earlier machines.

<< Previous | Index | Next >>



2006 San Diego Computer Museum
Questions about the website? Email us.

MEMBER