![]() There are nearly 350 members in our American Legion family in the small town of Green Lake, Wisconsin, home to less than 1,000 residents. Vintage Aristo Aviat 617 Air Navigation Computer with Original Box and Bag. Willis-Chapel Post 306 was chartered in 1929. Selling here is a vintage Aristo Calculator 622 slide rule, with original. ![]() Although no reasonable offers will be refused, I ask you to consider our efforts to raise funds for a new American Legion building and err to the side of generosity when you are making an offer.American Legion Post 306, an organization comprised of veterans committed to serving veterans, their families, and their communities. ![]() Navigation calculation is a means of determining the position of one’s vessel, by sighting a celestial body in the open sea where land is not visible. Having said that, I do not know what the current market will bear!Please make an offer. The NC-2200 is a navigation calculator capable of performing complicated navigation calculation and astro-navigation calculation, with speed and accuracy. There is some staining on the back side.Please view the photos and email with questions.The Buy It Now price I have listed reflects ebay auctions which have ended in the past 60 days. Opposite wind velocity (Scale E) read drift angle on Scale C.On the back side it looks like it can calculate distance, fuel and speed ratios. Opposite wind velocity (Scale E) read drift angle on Scale C.3) Ground Speed: Set index angle (Scale C) opposite true air speed (Scale D). Read index angle on Scale A opposite wind direction (Scale B).2) Drift Angle: Set index angle (Scale C) opposite true air speed (Scale D). Reasonable offers accepted Please ask about combined shipping. If you have any questions, please e-mail. New in package, package has some creasing. Offered for sale is a 1947 Esso Aviation Flight Calculator Round Slide Rule manufactured by Perrygraf Corp., Maywood Illinois.This is an advertisement for Esso Gasoline and a useful aviation calculator.This slide rule can calculate:1) True Course: On Scale A set variation (east or west) opposite course on Scale B. Vintage Weems Mk V111-C Computer - Navigation Calculator -NOS Aluminum, Weems System of Navigation.
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