Computer History Museum

Photoelectric Number Sieve Machine ("Gear Machine")

This gear number sieve was constructed to solve number theory problems such as factoring and determining if a number is prime. The machine also had a photo detector and powerful amplifier which was not included in the gift.

Photoelectric Number Sieve Machine ("Gear Machine") - Image 1
Photoelectric Number Sieve Machine ("Gear Machine") - Image 2
Photoelectric Number Sieve Machine ("Gear Machine") - Image 3

Item Details

Date
1932 (Made)
Type
Physical Object
Catalogue number
X85.82
Other identifying number
1 (of 1) (SERIAL NUMBER)
Number Sieve (MODEL NUMBER)
Organization
D. H. Lehmer / Robert Canepa (Manufacturer)
Credit line
Gift of D. H. Lehmer
Place of publication
North America/USA
Weight
275 (lb)
Acquisition number
X85.82