• 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.

System for recording movement thickness?

tick talk

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Sep 16, 2008
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I've come across reference to a vintage Swiss wrist watch movement of the 1930s described as size 10 (lignes) 15/12. I've seen this before with Swiss pocket watch movements, and vaguely recall the fractional number was a reference to hauteur/thickness, proportion of thickness to width, or some such. Can someone please enlighten me on this system?
 

tick talk

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Here is a page from the V&C photo reference archives with many examples, both pocket and wrist.
IMG_1599.JPG
 

tick talk

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Sep 16, 2008
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Brilliant Enrico, that helps for those written as x/12. Can you tell me the meaning of those other fractional values, ie, 20/22, 20/21and 19/19?
 
Last edited:

gmorse

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Jan 7, 2011
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Hi Enrico,

That's interesting, the Swiss using 1/144 of a French inch (pouce) for this measurement; the Lancashire gauge also measured pillar heights in increments of 1/144 of an English inch, although it started at 1/8" as the zero point.

Regards,

Graham
 

eri231

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Jan 13, 2012
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I really have no idea of the other fractions / 21/22. Even 19/19 would not make sense when referring to a measurement. For the mainsprings it was different measurement methods but for the movements I only know the lines and fractions in twelfths. For the glasses of the cases there are measures in / 8 and / 16
regards enrico
 

tick talk

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Sep 16, 2008
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Philip gave me the answer to the other fractions, nothing to do with thickness. Its the relative size of front and back movement plates! Now I can rest easy, have learned something new today.
 
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