Mainsprings for New Haven 30-day movement

ansoniaman

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Nov 24, 2015
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The New Haven 30-day movement used in my Rutland model calendar clock uses 2 mainsprings for driving the time-only gear train. Does anyone know the size of these springs? Thanks for your assistance.
 

Willie X

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Feb 9, 2008
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I've never seen that movement but I would try a couple of .0165" x 96 inchers. To weak go with .018". Probably can find them as 10 footers too.
Willie X
 

harold bain

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Nov 4, 2002
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Best way to find the right size is to measure what is in the clock now. This movement is not listed in our mainspring chart from LaRose.
 

ansoniaman

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Nov 24, 2015
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Thanks for the responses... I just measured one of the old dirty springs. Measures 3/4" wide and 108" long. I don't know the thickness (strength). I see that Timesavers has both a 3/4"x.014"x108" and a 3/4"x.016"x108" spring available. Since the movement uses both springs to drive the time-only gear train I am thinking I should go with the .014" thick spring?
 

ansoniaman

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BTW I was not familiar with the New Haven 30-day movement prior to owning this calendar clock. An English patent number is stamped on the movement.
 

Willie X

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Yes, what Harold said. I had assumed the springs were missing. If the springs have a rough and mottled appearance, they could be wrought iron springs. Wrought iron springs are by nature thicker than modern springs but not stronger. I do not usually replace them unless they show cracks or rust.
Willie X
 
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ansoniaman

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Thanks, Harold and Willie. The clock had not been stored properly for many years, so both springs are very rusty. I movement is very dirty but should clean up nicely.
 

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Rockford's early high grade movements by Greg Frauenhoff