Bob Holmström, Editor, 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., 11929 East Hill Drive, Chesterland OH 44026 Phone: 440-729-4811

Ernie Martt, Founding Editor, Phone: 440-247-6712, Phone: 440-247-6712 <emartt@cyberdrive.net>

An HSC meeting will be held at the NAWCC National at 4pm, Thurs., June 24, with member-contributed topics. The AHS meeting will be at 5 pm, Fri. June 25, Gerald Marsh speaking.

Rock the Boat comments have been relocated to the end of this issue. These are meant to be comments no longer than half a page on horological topics, including controversial ones, but not personal. A quick way to write a short article, convey an important idea or ask a question.

There are no new 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.

Page Contents

1 Index of this issue.

2 Quantifying Temperature and Barometric Effects in Free Pendulum Clocks by Robert L. Belleville

11 Some Mathematics of the Cantilever Pendulum by Alan Emmerson

20 The "Muchless" Electromagnetic Pendulum Drive Circuit by Ned Bigelow

23 "Everything " by Alan Heldman

25 From Riefler and Reynolds via Eiffel to Von Karmen by Alan Emmerson

29 A Note on Sinusoidal Drive of a Pendulum by Robert Matthys

31 Heldman response to Emmerson re chaos

32 Why Alan Heldman's Water Clock Works by George Feinstein

32 HSN Archive Project by Bob Holmstrom

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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