Horological Science Newsletter 1998-4
National Association of Watch and Clock Collectors, Inc.
Horological Science Chapter #161
Issue 1998-4 23 July 1998
Ernie Martt, editor. 278 Bentleyville Rd. Chagrin Falls, OH 44022 USA
Phone: 216-247-6712 E-mail: email@example.com
Sec. &: Publisher: Bill Givens, 3850 Ashford Dr., Eugene, OR 97405 Phone (H): 541-465-9311 E-mail:
Treas.: Everett Jones, 11929 East Hill Drive, Chesterland OH 44026 Phone: 216-729-4811
We need more articles for the HSN. Many of you are working on interesting projects which could
be shared with our readers for the benefit of all. We can generally publish them within an issue or two,
so you can become instantly famous!
The Eastern States Regional, August 14-15, 1998, in Syracuse will have an HSC meeting with Ned
Bigelow as the speaker. He will describe improvements in his dual pendulum clock, including
his use of the MicroSet timer to adjust it.
Gordon Uber has volunteered to copy for our readers a master's thesis by Blair R. Martin titled An
Analytic Investigation of the Ultimate Accuracy of the Pendulum Clock as well as an article by
Airy. The price for the Martin thesis is $18 or with the Airy article, $19. The Airy article separately
is $2. For details, contact Gordon. His e-mail address is <firstname.lastname@example.org> and his mail is at 3790
El Camino Real #142, Palo Alto, CA, 94306-3314, phone 650-940-1957.
1 Index of this issue.
2-5 Dual Pendulums- a Comment, an Alternative System, and Gravity Survey Pendulums by Doug Bateman. These
comments are stimulated by Ned Bigelow's article in the 1998-3 HSN and include a description of the Gulf
Oil double pendulums made in the 1960's.
6 A request for a source of front-silvered mirrors, by Ted Wale. Also, a note by Alan
Heldman on importance of concentricity for clock pulleys.
7-9 Effect of the Pendulum Rod on Q by Robert Matthys. Bob presents test results showing that Q
is reduced somewhat as the diameter of the rod is increased
10 Bob Matthys has an open letter requesting the help of mathematicians in applying the
Laplace Transform to study the effects of ground shock on pendulums.
11-16A summary by E. C. Martt of a paper sent by Bob Matthys on Inertial Test Slab Stability
Study by Ralph T. Berg. The original is a de-classified paper from the archives of Honeywell, Inc.
and is an investigation of various types of soil and rock for suitability for gyro test platforms. Bob
was also involved in this study. -The results are equally applicable to clock platforms.
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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