• 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.

Timegrapher Project

NoraE

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Jul 26, 2020
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Like everyone else in the hobby / profession I felt I needed a timegrapher though even the cheep ones were out of reach. So I tried to find something for a phone app and came across this as a free pc down load.
About Watch-O-Scope - Watch Timing System It requires an OP amp to work, but also gave plans to make it, the PC board, and a mic stand. I thought since I know how to solder and can read a schematic I'd give it a try. It's my first from scratch project and am happy that it turned out. I went with a breadboard because I didn't feel the desire to learn to etch anything at this time. It's obviously not finished but it works. I have no idea what the graph represents so I'll just have to learn.

WOS Amp.jpg WOS.jpg
 
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Dr. Jon

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NIce. If you have a phone or an ipod touch with a four way input all really need is a microphone. The audio amps in these devices are a lot better than anything anyne but a very professional audio engineer is likely to build. I am not disparaging amateur electronics, but, pointing out the phone makers spent a lot of time and money on these designs.

The graph output is telling you several things:

The vertical separation between successive "hits"is the measure of how close the watch is to being in beat, The AP figured this out and posted it. The jumps are due to the line moving and the system resetting. It curvature tells that teh watch rate is varying usually because it needs new lubrication. A well set up watch will lay down a straight trace.

The Witsci site ,

Instruction document, you can download instructional material on what the traces mean.
 
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Dr. Jon

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No the jumps are not overbanking. When that happens the traces get completely disorganized and it takes several seconds for a clean(readable) trace to develop again. The software is processng the delays modulo a fixed time and resetting.

All of the various pathologies are described in the Witschi publications that are available from the site.

The one time I did see my wat ch overbanking, the reason was that the clutch on the mainspring had stuck. It was winding too hard, which showed up after wearing the watch on a long run.
 
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DeweyC

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www.historictimekeepers.com
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Like everyone else in the hobby / profession I felt I needed a timegrapher though even the cheep ones were out of reach. So I tried to find something for a phone app and came across this as a free pc down load.
About Watch-O-Scope - Watch Timing System It requires an OP amp to work, but also gave plans to make it, the PC board, and a mic stand. I thought since I know how to solder and can read a schematic I'd give it a try. It's my first from scratch project and am happy that it turned out. I went with a breadboard because I didn't feel the desire to learn to etch anything at this time. It's obviously not finished but it works. I have no idea what the graph represents so I'll just have to learn.

View attachment 608964 View attachment 608965
Nora,

This seems to have all the functions of my Microset at 1/20th the cost. Nice find. I looked at what he uses for the timebase, and the soundcard may work although it would be terrific if he pulled the time calibration directly off NIST. All those fuunctions help with diagnostics.

Also, it appears like there is a setting to trigger for the signal to be used for amplitude. There are some watches that are very quiet and difficult to measure amplitude.

When I do long term timing tests for chronometers, I check at the same time every 24 hours. Before the test I do an update to my computer clock as provided by NIST using NetTime. I found that in those 24 hours my computer clock can drift up to 2 seconds.

But, unlike my Microset, the system you found can be calibrated before each use. And to be honest, I take my readings from the MU-700 with blind faith (been told by Dale Sutton they either work right or not at all).
 

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