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Number Of Winds In A Mainspring

WillFly
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WillFly Distinguished Member

WillFly

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It's always interesting to see how different watch movements require different numbers of complete wind revolutions to get the mainspring up from totally unwound to totally wound. Some watches - like my Hamilton with its ETA 6497 movement - seem to wind for ever, while some seem to become fully wound very quickly.

 

Is there a ratio between mainspring length and gearing - or is the size and capacity of the mainspring barrel more arbitrary? Some of my US railroad watches are just over 40 hours in capacity, while one or two - like my Illinois "Bunn Special" are 60 hours.

Edited by WillFly
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