• 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.

30 Day New Haven Movement Mainsprings

Laurie Kimble

Registered User
Jan 30, 2011
65
10
8
A New Haven 'Columbia' wall clock with a 30 day movement came into the shop. Its the NH movement that says 'Patented in England' and has the double wheel on the motion works. Upon disassembly I have discovered that the two mainsprings are different. One is .0185 and the other is .0165. Both are 3/4" x 96" long.

Anybody have any ideas as to which is the correct mainspring size? I would think they would both be the same but please correct me if I am wrong.

I have attached pictures - all are taken before movement overhaul.

DSCN7886.JPG DSCN7888.JPG DSCN7889.JPG DSCN7890.JPG DSCN7891.JPG
 

Dick Feldman

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Sep 1, 2000
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Ninety-six inch length springs sound to me like 8 day springs. You will never get 30 day run time from those springs in that clock.
In that application, I doubt if you will notice the difference between .0185" and .0165" thick springs.
Either will operate well.
A bigger factor with that clock movement will be solving wear and thereby reducing friction.
JMHO
Dick
 

Laurie Kimble

Registered User
Jan 30, 2011
65
10
8
Ninety-six inch length springs sound to me like 8 day springs. You will never get 30 day run time from those springs in that clock.
In that application, I doubt if you will notice the difference between .0185" and .0165" thick springs.
Either will operate well.
A bigger factor with that clock movement will be solving wear and thereby reducing friction.
JMHO
Dick
You are right Dick - the springs are 108" long not 96" as I previously stated. My bad!

I looked in Dick Swan's book at a New Haven 30 day Willard style Banjo and he lists the mainspring at .024" That seems really heavy to me. I also looked at Tran du Luy's ST book and there the 30 day #86 movements are listed at 108" and .015 thickness.

Both springs are in very good condition. My concern is mainly the difference in strength between them and how it will affect the running of the movement. And I was wondering which spring was the correct one - the lighter (.0165) or the heavier (.0185).

The movement shows very little wear. Only 2 bushings were needed.
 

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