NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Paul Dolkas
Date: 2023 Feb 7, 00:40 +0000
Alan-
Pilots have been using circular slide rules for years – the sainted E6-B. But they don’t have the hairline, and they usually aren’t bigger than 6” or so. I think the emphasis is on speed rather than 3-digit accuracy.
-Paul
From: NavList@fer3.com <NavList@fer3.com> On Behalf Of
Alan S
Sent: Monday, February 6, 2023 4:00 PM
To: Paul Dolkas <paul@dolkas.net>
Subject: [NavList] On slide rules
Ed:
Have a few myself, fascinating devices, and in an ever increasingly complex world, the "stick" rules had only 2 moving parts. The bambo rules are self lubricating I understand. As for the metal ones, a bit of oil seems to do
the trick.
Moving on, did you ever come across the circular type. They were made by Gilson as I recall. The 8" diameter rules, with the C scale being outboard, provide a C scale 24" long, which in theory would be more accurate than the
standard 10" stick type. The circular slide rule never seemed to have taken off though. Curious, but then the stick type might have been to well established to buck. Take care.
Alan
