Rules and Practice for Adjusting Watches

ning a Pleasing Appea

ection made in regard to Fig. 3 is analyzed. The balance had twelve screw holes in each rim, with the space between the first and second holes from the arms equal to double the space betw

g.

ward three holes. Or those in either the first or second holes could have been shifted to the ninth holes and th

f three holes at another point which would not present a very good appearance for high grade work. Therefore the alteration made was to move the

g.

will show that the desired correction was obtained with a better appearance of th

, for the reason that the alteration did not carry them beyond the center of the rims where the greatest curvature takes place. The screws moved from the eighth to the ninth holes however were estimated for the full correction of four or five seconds which is to be expected through shifting a normal pair of screws from one hole to another beyond the center of the ri

ost instances and also have a well-appearing balance. There is also less disturbance of the poise usuall

Screws are Above or Belo

of course will not produce a correction as great as will be obtained by shifting regular screws. Sometimes platinum, or other extr

Under Com

of the screws because the temperature variation will make it necessary to mass al

ward too far at the free ends in heat and outward too far in cold. When the extent of this error is so great that the rate is still fast in heat, with the screws massed i

red to the proportion of brass in the rims. This prevents the free ends of rims from curving inward far enough to carry the weight the proper distance toward the center

s must remain the same or the timing will be seriously affected. It is also important that the poise be tes

ions for Over or U

arger or a smaller hairspring. For instance, we will assume a case of under compensation in which the screws have all been massed at the holes nearest the cuts. If the spring has seventeen coils, a correction of from

ake, one coil smaller, will permit of shifting one

pensated, there was very slight difference in the temperature variation of the watch. Also by changing pinning points or breaking out one-fourth to

ings with others of larger or smaller size, variations o

ble space between the collet and inner coil of the original spring, and the new spring was colleted quite close, there might be the addition of an extra coil in the inside only. This was found to produce only a very slight correction, compared

mperature Variation is not Alway

............. Make

-10 + 4 +

+ 4 + 5 +

+18 + 1 -

8

g, and that the general condition of the watch may be responsible. The second column of Fig. 7, indicates an err

-fourth of a turn. In heat the arc of motion was at least one full turn. This diff

hardly have any bearing on this point it is sufficient to show in what direction the tendency would be. The fourth wheel end shake was very close and probably caused binding of the wheel in cold, due to greater contraction of the bridg

te was found to be eight seconds plus in h

osition in which they were before the alteration which caused the close assembling of the scr

n by chance within the limits of allowance the watch would undoubtedly have been a very unreliable timepiece. The errors in the watch would no doubt have been corrected during the position adjustment later, but the large error in tempe