Fowler & Co. in Manchester made this pocket calculator during the...
This bakelite and brass Fuller's cylindrical slide rule with serial...
Willgodt T. Odhner invented the pinwheel calculating machines in...
This is a circular brass calculator which was Patented by H and...
The Planimeter is the first instrument used for measuring area...
This Type II model with serial number 534960 was manufactured...
The Loga Company made this slide rule in Switzerland probably during...
This is a circular slide rule made in 1948. The entire scale disk...
This black Type II model with serial number 501613 was manufactured...