Notice: The next issue will list all members of the HSC, with name, State or Country, and e-mail address. Please let me know if you want any part of your address omitted.

A change in day and time: The Eastern States Regional, Syracuse, will have an HSC meeting at 2:30 pm on Friday, Aug. 15, 1997, with Evan Edwards reviewing technical highlights of the Atlanta National. Our HSC Treasurer, Everett Jones, will speak at the Tower Clock meeting of the Regional on restoration of a Howard tower clock for Chardon, OH.

There will an HSC meeting at the NAWCC Seminar in Bristol, CT on FRIDAY, Oct. 24, at 8 pm and will include 3 to 4 short technical talks. The American Section of the AHS will meet at 9 pm in the same room, with Gerald March, England, as the speaker. All Seminar attendees are welcome to both meetings.

There will be an HSC meeting at the NAWCC Seminar in Bristol, CT in October 1997, tentatively scheduled for Thursday, October 23 at 4:30 pm to 5:30 pm before the conference officially opens.

Page Contents

1 Index, meeting notices

2 New information on Invar in the NAWCC LIbrary, and review of a booklet by an HSC member, Dr. David S. Goodman.

3-6 Bryan Mumford describes his Design of a New Clock Timer Tool: The Microset Timer. Bryan achieves a high degree of accuracy with an inexpensive quartz crystal, which, when coupled with a computer interface, allows for convenient analysis of data. He has started a revolution in timers.

7-10 David J Smith uses the Microset Timer to determine the Escape Wheel Signature of two pendulum clocks. With his procedure he can discern repeating variations in each tooth of the wheel. Yet another revolution!

11-13 Gordon Uber begins Part I of a description of The Global Positioning System For Horological Timing. This part describes the system in general, and Part II will cover the TAC-2, a device that can be purchased for applying the GPS timing signals to clock measuring devices.

14-27 Part I of an article by Ted Wale on Chordal Pitch Gears as used by John Harrison. This is an interesting design paper on gears not likely to be familiar to most of us, yet they have significant historical importance.

E.C. Martt

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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