TitleLehmer Number Sieve, bicycle chain
|Other number||#109||Verso pencil|
Dimensionsoverall: 10 in x 8 in
DescriptionB&W image of D.H. Lehmer's bicycle chain number sieve. The chains are on an axle which is supported by a "sawbuck" of 2x4's. The driver motor is on a shelf below the chains.
CreditCourtesy of Gwen Bell
|102622804||Lehmer - Bicycle Chain Sieve|