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Mannheim Slide Rule Made in 1920 by Albert Nestler No.9...
This is a rare Albert Nestler early Mannheim slide rule no.9 with...
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Unique Adix Adding Machine, c.1905, Made in Germany
Adix is a relatively simple column adder for adding numbers up...
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New Allbrit Planimeter by Stanley With Instruction Manual
This almost new Planimeter is a Polar type integrating machine...
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Halden Calculex Circular Slide Rule circa 1910
This is a circular side rule made of German silver and glass by...
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Allbrit Pole Wagon Polar Planimeter by Stanley
This Planimeter is a Polar type integrating machine that was made...
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Allbrit Polar Planimeter by Stanley
This Planimeter is a Polar type integrating machine that was made...
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Fowler's Universal Calculator
Fowler & Co. in Manchester made this pocket calculator during the...
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Calculating Slide Rule for Measument of Land in Acres
W.F Stanley area computing scale for calculating the area in acres...
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Otis King Slide Rule Model 'K'
Otis King Slide Rule Calculator Model 'K'. Otis King is a cylindrical...
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