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>

Page Contents

2 - 12 Designing the Dead-Beat Escapement On a MS Excel Spreadsheet by Ernest C. Martt

13 - 16 Shortt Tuning Fork Timer? Question by Philip Woodward and response by several HSN readers

17 - 18 I Have Spoked! By Henry Casson

18 Rock the Boat Again - Flexures and Circular Error by Dallas Cain

There are 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 May 1st.

An important paper that deals with theory and experimental confirmation of coupling between dual pendulums has been published on the Web.

Huygens' clocks by Matthew Bennet, Michael Schatz, Heidi Rockwood and Kurt Wiesenfield.

"The 336-year-old synchronization observations of Christian Huygens are reexamined in modern experiments. A simple model of synchronization is proposed."

http://www.physics.gatech.edu/schatz/clocks.html

http://www.physics.gatech.edu/schatz/pubs/royclocks2.pdf

The deadline for material for the next issue is February 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.

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