NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Bill Morris
Date: 2014 Jan 27, 20:36 -0800
Brad and Peter
To help other members to visualise face gears I have attached a photo of the gear faces of a small indexing table I made about fifteen years ago, with an inset showing an enlarged view of some teeth. Advancing by one tooth indexes 3 degrees.
The differential indexing method of, e.g. 1/360 tooth forward and 1/361 teeth back to advance 10 seconds has I believe been used in advance-retard mechanisms in motor bikes a long time ago, with smaller numbers of teeth, of course.
Bill Morris
Pukenui
New Zealand
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