When the watch is held in a "vertical" position, say pendant up, then the balance is running on the sides of both pivots, which is an entirely different situation in terms of friction. When the watch is lying flat on its back, the balance is running primarily on the end of one pivot. When a watch runs in different positions, there are different dynamic forces at work on the various moving parts of the watch, in particular the balance and hairspring. SPONSORED ADVERTISEMENTS Adjusted to Positions
Pretty ingenious! By changing the position of the weight-screws on the balance, a skilled watch adjuster could increase or decrease the amount of temperature compensation over a range of temperatures. In cold temperatures, when the balance spring is stiffer, the limbs of the balance will curl outward a tiny amount, thus decreasing the rate of the watch as compensation for the increased stiffness of the balance spring. This type of compensating balance is also called a "cut-balance" because the balance rim is not continuous it is "cut" at two points to allow the bi-metallic balance rim to expand and contract slightly with changes in temperature.īecause the brass has a greater coefficient of expansion than does steel, an increase in temperature will cause the "limbs" of the balance to curl inward a tiny amount, thus increasing the rate of the watch. Since a mechanical watch uses a metal spring (the balance spring or "hairspring") as its primary time-keeping mechanism, the "stiffness" of that steel spring will vary at different temperatures, thus potentially altering the timekeeping rate of the watch.Ī major breakthrough in temperature compensation was the bi-metallic "compensating" balance, typically made out of a layer of steel fused to a layer of brass. Temperature adjustment was designed to keep the watch running at a consistent rate across the widest possible range of temperatures. Typically, the higher the number of "adjustments" the higher the quality of the watch. What these markings are referring to is the way the watch was made and adjusted for proper time-keeping before it left the factory. 5 Pos." or some other proclamation of superior "adjusted" quality. It's not unusual to see a vintage watch movement marked "Adjusted" or "Adjusted to Temp. Pocketwatch 101 ℠ – Learn about Vintage and Antique Pocket Watches What does "Adjusted to Temperature and Positions" mean?
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