Archive of Collections

Details and Image

TypeModel No.MakerCountryConstruction
DateScale LengthArea of Use
Slide Adder
Omega 9-Column Slide Adder
Hong Kong
Adding and Subtracting

Notes: "The Omega slide adder was made in Hong Kong, and was one of the nicer copies of the Addiator design. The design of the exterior of the Omega was copyrighted by T. H. Ramsey in 1964. The Omega adders (there was also a 6-column version) may have been made for a company in Campbell, California called Wescosa. Some are marked “Made exclusively for Wescosa”. "

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