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General question about pendulum lengths

whcureton

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Oct 27, 2010
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Hello Fellow Clock Lovers

Today's question is the June installment of the age old "pendulum length" question. On the back plate of an Ansonia it is stamped "5 1/2" for five and a half inches. When I measure from the top of the pendulum ribbon down to the tip of the threaded pendulum rod I find it is 7 inches long. The pendulum proper, however, is only 4 and 1/2 inches long (this may not be the original pendulum). To provide the correct assembly length what do I measure to arrive at the 5 and 1/2 specification?

Thank you!
- Bill in northern California
 

Willie X

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Feb 9, 2008
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It's kind of amazing how many people seem to be so concerned about this number matching something. Never has and never will, just a guideline so the manufacturer can sort the movements into general categories.

My 2, Willie X
 

whcureton

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Oct 27, 2010
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Thanks Harold and Willie

I'll check the treads Harold ... for a refresher ... I know I've read some of these before because I think this is the SECOND time I've asked this question ... about a year apart ... my memory ain't what it used to be ... hence ... "The June installment of the age old pendulum length question" remark. But I REALLY like Willie's reply ... that's my kind of answer ... I thought I was going to have to sweat various pendulum and rod lengths. What a relief.

- Bill in northern California
 

Scottie-TX

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Apr 6, 2004
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. . . . and besides WILLIE's observation, not all mfrs. measure the same dimensions. Some measure from centershaft, others from suspension, etc. If the (I'll call it) classic definition is used of a theoretical pendulum then that would be to the apx. center of the bob.
So; If you had a 3" dia. bob, you may measure 5 and 1/2" to bob center and 7" to reg. nut, and inchanda half distant.
 

shutterbug

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Oct 19, 2005
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. . . . and besides WILLIE's observation, not all mfrs. measure the same dimensions. Some measure from centershaft, others from suspension, etc. If the (I'll call it) classic definition is used of a theoretical pendulum then that would be to the apx. center of the bob.
So; If you had a 3" dia. bob, you may measure 5 and 1/2" to bob center and 7" to reg. nut, and inchanda half distant.
I'll just add that in theory, 5.5" from suspension point (top pin) to center bob.
 

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