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Information Please!

From The American Horologist and Jeweler magazine, October, 1946

AB - Is there some form of electricity in the human body that will throw a watch out of timing? I think there is, so I ask, "Am I right or wrong?"

Answer: There is no electricity in the body that effects the running or timing of a watch. However, it does occur that the same watch does not run exactly the same for different persons, due to the fact that the habits of these different persons are not the same.

Some persons are careless about regular winding, and carry a watch in a pocket where the watch receives considerable shaking up. This same watch in the hands of another person might receive little, if any, abuse. Thus, a watch is generally regulated to the habits of the wearer.

JM - I am familiar with the expansion balance, and how adjustments are made for temperature rates. However, I do not quite understand how temperature adjustments are made where a solid balance is employed. 

Answer: Our modern solid balance wheels have a very small temperature error. However, corrections are made by moving the timing screw away from the balance arm, or toward it. In the solid balance, the arm expands or contracts slightly. Due to this expansion or contraction, the wheel becomes what we might call "egg-shaped," This means that the rim itself will pull in toward center when the arm expands, causing a change of rate. Moving the screws toward the arm will correct the rates, depending an whether the watch runs fast or slow between the two extreme temperatures.

ART-Can you offer any suggestions as to haw to true and level a hairspring while in the watch?

Answer: The following diagrams illustrate the method of leveling and circling the spring. 

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