August 1997
Abstract
Volume 139 no.8
The August feature, and front cover, describes a new self-winding movement by LANGE. True to the tradition
of this reborn Glashütte company it has unique features. A new movement by PIAGET is also reported.
Practical articles describe a clock by Fenner which uses circular error to compensate for temperature
and pressure changes, a screwdriver sharpening jig (Bossingham), planetary gearing as motion work (Hastings)
and dead-beat escapements (Pipes). Alan Bromley takes a very close look at his SYNCHRONOME and finds that
the period of its pendulum fluctuates from minute to minute. Two 'Viewpoint' pieces deplore respectively
the dumping of expensive new watches at auction and the use of ammonia in cleaning brass. The BHI announces
subsidised training courses for watchmakers and there are the usual interesting letters.
Table of Contents
Feature
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260-261 Automatic LANGE, Timothy Treffry
Articles
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262-265 A Seconds Pendulum Using Circular Error Compensation, Robert J Fenner
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266-267 Screwdriver and Graver Sharpening Jig, Richard Bossingham and Ron Green
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268-271 Planetary Gearing for Motion Work, Peter Hastings
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272-274 Short Term Pendulum Variations, Allan G Bromley
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276-277 Making Accurate Dead-beat Pallets, Malcolm Pipes
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278-280 Grasshopper Escapement Model, Norman Jacklin and Archie Pollard
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281 Ammoniated Cleaning Solutions, James Moss
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Copyright © 1997 UBR, Inc.
Abstract courtesy of Timothy Treffry, Editor. Data courtesy of BHI. Updated 5 Sep 1997 <clocks/bhi/hj/hj199708.html>
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