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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Emmanuel Chemla
Date: 2022 Dec 11, 05:46 -0800
Hello from a newbie,
To tell it like it is, I'm no seaman at all but what I indeed am is a "slide rules lover". I've got a french user manual teaching the slide rule's art. It's called "La règle à calculs" authored by André Robichon. Strangely enough, he describes a slide rule that I've never seen anywhere except in the Bob Goethe's slide rule.
You can check it here : [LINK] going to the page n°3. You'll see there a rule with three scales T1, T2, T3 annotated 0.1 x, x, 10 x.
They begin (left-end side) each with values of 5+ °, 45°, 84+ °
To sum it up:
- 0.1 x --- T1 --- 5+°
- x --- T2 --- 45°
- 10 x --- T3 --- 84+°
My question is : since this scale order is unknown in any rules I've ever seen, and since this scale order is the one Bob Goethe retained to design his own model, which "classical" slide rule inspired this model. On which commercial slide rule can we see those three scales ?
