Rules and Practice for Adjusting Watches

859, has it been possible to control the variation in pocket timepieces which is caused by changes in temperature. Previous to this int

uch advancement has been made, that this variation has been reduced to seconds and temper

e more intricate cases such as "stoppers" and radical rates that may require investigation of the inner workings of the movement. The simplicity of the adjustment naturally becomes more apparent with e

justment can be undertaken with considerable c

g thorough in Position adjusting. The subject is covered, however, for the benefit of those who may desire pra

he Rate is Either Slow or Fa

ause when the metals expand the hairspring becomes weaker and produces a loss in time. During this period the free ends of the balance rims, car

their true form and the concentrated weight of these screws near the ends reduces

y to move the screws away from the free end of the rims. In doing this, less weight will be carried toward the center as

d Distortions of Co

are firmly soldered together and the distortions in changes of temperature are as follows. In heat both metals expand, which infers that the rims become longer as well as wider and thicker. Brass expands more than steel and because of its

eel, pulls the rim outward at the free end whic

utward from the center of balance, when the free end moves in, and inward when the free end moves out. In comparison,

and Expe

grows stronger or weaker with changes in temperature. When it becomes longer, wider and thicker in heat, experiments seem to prove that the increased width and thickness are not in proportion to the increase

and 90 degrees Fahrenheit was found to be from eighty to one hundred and sixty seconds. With the same balances cut the erro

having been cut, showed a considerably reduced error, indicating that t

s noted, regardless of scientific or established formula relati

ing Screws to Dif

merican models do not have mean time screws and are therefore generally supplied with seven or eight pairs of balance screws. The mean time screws are never

ordinary repairs, as the adjustment may be destroyed in so doing. With the larger balances the moving of one pair of screws for a distance of one hole, generally makes a difference of four or five se

obtained in moving a pair of screws from the center of the rims out to the cut, compared to moving a pair of screws from the holes nearest the arms out to the center of the rims. This principle also obtains in moving the screws in the opposite direction and is due to the fact that while th

ained by shifting various pairs of screws certain distances. This information is then used in making alterations with considerable certainty. The expert temperature adjuster becomes fully inf

ause intelligent arrangement of the balance screws, for each model, when they are originally fitted. The pro

f the Temperat

or readjusting. The balance may be retrued and repoised many times and the spring may be retrued, altered, or even changed, without seriously interfering with the temperature rating, as long