Description: Circular Slide Rule (Navigator's)Vintage Logarithmic Engineering Pocket Device USSR Rare mathematical slide rule In Original Case. The slide rule, the prototype of which was the so-called Gunter's line, was invented by the English mathematician E. Gunter shortly after the discovery of logarithms and described by him in 1623. In the 60s there was such an experiment - to produce these rulers in round form. In this case, the role of the marks on the slider was played by the arrows, and the moving part of the ruler body itself was moved to the reverse side. In addition to engineers, such devices were used by navigators for navigation calculations. Slide rules have been completely replaced by electronic calculators. Could be a great gift for someone you love or can be added to your collection. Contact me if any questions. I do offer combine shipping discount if you buy 2 items or more. I make shipments the next business day after the purchase. Buyer protection is in effect. Please watch the photos carefully as they are important part of description. Thanks for your interest. Have a look at some other lots at our store. 💛💙
Price: 48 USD
Location: Kharkiv
End Time: 2024-09-11T12:02:05.000Z
Shipping Cost: 10 USD
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Item Specifics
Return shipping will be paid by: Seller
All returns accepted: Returns Accepted
Item must be returned within: 30 Days
Refund will be given as: Money back or replacement (buyer's choice)
Return policy details:
Country/Region of Manufacture: USSR
