• Important Executive Director Announcement from the NAWCC

    The NAWCC Board of Directors is pleased to announce that Mr. Rory McEvoy has been named Executive Director of the NAWCC. Rory is an internationally renowned horological scholar and comes to the NAWCC with strong credentials that solidly align with our education, fundraising, and membership growth objectives. He has a postgraduate degree in the conservation and restoration of antique clocks from West Dean College, and throughout his career, he has had the opportunity to handle some of the world’s most important horological artifacts, including longitude timekeepers by Harrison, Kendall, and Mudge.

    Rory formerly worked as Curator of Horology at the Royal Observatory, Greenwich, where his role included day-to-day management of research and digitization projects, writing, public speaking, conservation, convening conferences, exhibition work, and development of acquisition/disposal and collection care policies. In addition, he has worked as a horological specialist at Bonhams in London, where he cataloged and handled many rare timepieces and built important relationships with collectors, buyers, and sellers. Most recently, Rory has used his talents to share his love of horology at the university level by teaching horological theory, history, and the practical repair and making of clocks and watches at Birmingham City University.

    Rory is a British citizen and currently resides in the UK. Pre-COVID-19, Rory and his wife, Kaai, visited HQ in Columbia, Pennsylvania, where they met with staff, spent time in the Museum and Library & Research Center, and toured the area. Rory and Kaai will be relocating to the area as soon as the immigration challenges and travel restrictions due to COVID-19 permit.

    Some of you may already be familiar with Rory as he is also a well-known author and lecturer. His recent publications include the book Harrison Decoded: Towards a Perfect Pendulum Clock, which he edited with Jonathan Betts, and the article “George Graham and the Orrery” in the journal Nuncius.

    Until Rory’s relocation to the United States is complete, he will be working closely with an on-boarding team assembled by the NAWCC Board of Directors to introduce him to the opportunities and challenges before us and to ensure a smooth transition. Rory will be participating in strategic and financial planning immediately, which will allow him to hit the ground running when he arrives in Columbia

    You can read more about Rory McEvoy and this exciting announcement in the upcoming March/April issue of the Watch & Clock Bulletin.

    Please join the entire Board and staff in welcoming Rory to the NAWCC community.

IBM clock set time

Mopar

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Jan 4, 2019
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I have an IBM Type:S3 56-12 24 hour Clock
Works on 110v ac (Regular ac plug - no third wire)
Appears to use 3510 Hz on ac line to set time
Would like to build circuit to inject audio on ac to set time.

Clock.jpg
 

kinsler33

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Aug 17, 2014
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Check with the guys over at Electric Horology, which is oddly classified amongst our various message boards. They're really into these things and ought to be able to tell you how to hack the setting procedure. I also always wonder about that weird gas-filled electron tube.

I don't know how accurate that 3150 Hz has to be, but it wouldn't be all that difficult to use a 555 timer to make the appropriate oscillator. I also don't know what on earth the required voltage of that signal might be.

Mark Kinsler
 

flynwill

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Feb 1, 2007
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I also always wonder about that weird gas-filled electron tube.
https://frank.pocnet.net/sheets/201/5/5823.pdf

It is similar in operation an SCR. A voltage on the trigger connection starts a mercury arc that then allows the tube to conduct until the current goes to zero and the arc quenches.
The trigger needs ~ 70-100 V to trip. The transformer and capacitor circuits are designed to be resonate at the selected frequency and the transformer probably steps up the voltage considerably, but I would guess that it still needs a signal of several volts. Perhaps one of the folks that have actually worked on these machines can give you an idea.

Building a suitable sync signal generator might be an interesting project.
 

fdew

Registered User
Jul 12, 2007
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Anything is possible but I would isolate the clutch coil from the other components and entergise it with a external supply at the correct time (57 min 54 sec) for 8 sec from memory
 

Mopar

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Jan 4, 2019
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Anything is possible but I would isolate the clutch coil from the other components and entergise it with a external supply at the correct time (57 min 54 sec) for 8 sec from memory
Thanks, that is a quick and easy work-around.
 

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