National Association of Watch and Clock Collectors, Inc.
Horological Science Chapter #161
Horological Science Newsletter
Issue 1999-4 September 1999
Bob Holmström, Editor, Phone: 503-292-3685, <firstname.lastname@example.org>
Bill Givens, Sec. &: Publisher, 3850 Ashford Dr., Eugene, OR 97405 Phone (H): 541-465-9311 <Lbanks@ix.netcom.com>
Everett Jones, Treas., 11929 East Hill Drive, Chesterland OH 44026 Phone: 440-729-4811
Ernie Martt, Founding Editor, Phone: 440-247-6712, Phone: 440-247-6712 <email@example.com>
A Horological Science Chapter meeting will be held at the NAWCC Seminar in Minneapolis 7 p.m., Friday
October 29th with presentations on Member Projects. An Antiquarian Horological Society meeting will follow
at 8 p.m.
1 index of this issue.
2 Early beginnings of the Horological Science Chapter of NAWCC as recalled by Evan Edwards
3 Period Variation in an Electronically Maintained Clock by Robert Belleville
11 Pendulum Air Movement: A Failed Experiment by Robert Matthys
14 Phase Shifts in a Single-Coll, Sinusoidal, Pendulum Drive Circuit by Ned Bigelow
16 The compound cycloidal pendulum by Philip Woodward
17 "Smooth" Electromagnetic Impulse Without Electronics by Alan W. Heldman
19 Turbulent Discussions of Pendulums by Alan W. Heldman
19 "Comment on BellVille HSN 99-3" by Alan W. Heldman
20 Simplifying the drive circuit! (of HSN 1999-3) by Dallas Cain
21 reprint - "Spring Suspensions for a Pendulum" by Fedchenko & Fleer
26 Errata and Addenda to "Muchless" Article, HSN 99-3 by Ned Bigelow
26 Errata - Some Mathematics of the Cantilever Pendulum by Alan Emmerson
26 Comment on CDROM/web version of HSN by the editor
Above: Drawing from Apians Cosmographicus Liber of 1533, showing how a nocturnal is used to tell the
time at night from the Great Bear.
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