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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Pilot watch slide rules
From: Paul Hirose
Date: 2020 Jan 2, 23:50 -0800
From: Paul Hirose
Date: 2020 Jan 2, 23:50 -0800
On 2019-12-30 15:46, Sean C wrote: > But I think the solution would be to look on the tachymeter scale for the total number of seconds elapsed, and then read the number opposite (the seconds scale in reality) as the speed. The number 65 on a [non-rotating] tachymeter scale is roughly opposite the '11' or 55 seconds on a watch face. I believe you have it figured out. Switch the roles of the scales. Find seconds on the tachymeter scale. Opposite that value, read mph where you'd ordinarily read seconds. Wikipedia obfuscates the method with all that stuff about reciprocals and apple eating. I still think the very high values on the tachymeter have no practical application. The scale would be more useful if you replaced them with 55, 50 etc.
