National Association of Watch and Clock Collectors, Inc.

Horological Science Chapter #161

HOROLOGICAL SCIENCE NEWSLETTER

Issue 1996-2 April 1996

Ernie Martt, editor, 278 Bentleyville Rd., Chagrin Falls, OH 44022

Phone. 216-247-6712; Fax 216-247-1104; E-mail: emartt@cybergate.net

Sec. & publisher, Bill Givens, PO Box 1337, Eugene, OR 97440 Phone: (H) 503-465-9311, (W) 503-465-9311; E-Mail: ibanks@ix.netcom.com

Treasurer, Everett Jones, 11929 East Hill Drive, Chesterland, OH 44026 Phone: 216-729-4811

Dr. Jerome Walker will speak at the 1996 Cleveland National at 3 pm, Friday June 21 on "Trials of Making a Precision Clock". Don't miss it. Following him, hopefully, will be Prof. E.T.Hall, England , on The Littlemore Precision Clock. These talks, and discussions, will consist of the Chapter meeting. I still have some 12mm diameter quartz rod, 51 " long, for pendulums, at $21 plus pack & ship. . This issue is dedicated to Dr. Philip Woodward, since half of it is either about him or written by him. His book, My Own Right Time, should be in the hands of every horologist; it was reviewed in the 1996- 1 issue of the HSN by Ned Bigelow. For those who do not have a copy, it can be purchased from Oxford University Press, 198 Madison Ave., New York, NY, 10016. Their phone is 212-726-6000, Fax 212-726-6440. Lindsay Publications, PO 538, Bradley, IL 60915 also carries it for $46 (info from Bob Matthys).

Page Contents

1996 National, quartz rod, US sources for My Own Right Time.

2-3 A bibliography of Dr. Philip Woodward's horological articles. You will find this a most useful and handy reference list for many important horological topics. He is a master of clear presentation.

4 Dr. Woodward's biography. Also, a short article by Doug Bateman, Instability of Materials- a query. He asks, why use a rod at all? Why not use a tensioned bundle of fibers? (Or fibres, in English!)

5 Ned Bigelow reviews a series of six recent articles in the Horological Journal by Dr. Woodward entitled A Study of the Spiral Hairspring. The article covers early attempts to describe aspects of hairspring behavior, and then proceeds to use computer math programs to do what could not be done years ago. His articles have been conveniently bundled into a little booklet available from the HJ for $5 at the address shown at the end of the article.

6-7 Dr. Woodward writes on the Fritz Experiment-- he puts into mathematics the findings of Norm Fritz in the 1996-1 HSN article titled Pendulums Driven Off Resonant Frequency.

8-10 Dr. Roger Irving continues the topic of quartz rods with an article A Fused Silica Pendulum Rod. He describes his method of attachment and his beginning experiments. His biography is on page 10.

11-13 Evan Edwards continues his reports on his precision clock and calculates The Effect of Moisture in a Carbon Fiber Pendulum Rod. His calculations are included.

14 Comparison of driving weight for some weight-driven clocks, by Ernie Martt.

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

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