Bob Holmström, Editor, 2934 NW 53rd Drive, Portland, OR 97210 Phone: 503-292-3685, <holmstro@europa.com>

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 <emartt@oh.verio.com>

Issue 2001-4 Nov 2001

Page Contents

2 - 5 Evaluation of Gravity Interaction Between Pendulums by Ned Bigelow

6 - 9 The suspension spring without a formula in sight by Philip Woodward

10 - 13 An Isochronous Clock by Bernie Tekippe

14 - 16 New Horological Science Research Tool Available at NAWCC Library by Fortunat Mueller-Maerki

17 Erratum and Addenda to English Watches with Robin's Escapement by J. Ganczarczyk

18 Rock the boat - Gravity Compensation? by Richard Whitehead

23 corrections to roster + note from Paul Hopkins + Invar book note

There are no Rock the Boat items in this issue. These are meant to be comments no longer than half a page on horological topics, including controversial ones, but not personal. This is a quick way to write a short article, convey an important idea or ask a question.

The deadline for material for the next issue is December 15th.

Bob Holmström

Above: Drawing from Apians cosmographicus Liber of 1533, showing how a nocturnal is used to tell the time at night from the Great Bear.

Bob Holmström

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