National Association of Watch and Clock Collectors, Inc.
Horological Science Chapter #161
Horological Science Newsletter
Issue 2001-5 December 2001
Bob Holmström, Editor, 2934 NW 53rd Drive, Portland, OR 97210 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., Phone: 440-729-4811
Ernie Martt, Founding Editor, Phone: 440-247-6712, Phone: 440-247-6712 <email@example.com>
Issue 2001-5 Dec 2001
2-19 Circular error of a pendulum on a suspension spring by Philip Woodward
20-21 Pendulum spring / circular error references by Bob Holmstrom
22 Reply to Richard Whitehead (2001-4) by Philip Woodward
22 All Pneumatic Clock? - Rock the boat by Michael Payne
The deadline for material for the next issue is February 15th.
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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