A better rate than this was desired and further examination proved that the locking of the pallet stones and escape teeth was quite strong and caused the pendant up motion to have a shorter arc than would have been entirely desirable. An alteration was made by pushing the receiving stone further back into the slot and rebanking the escapement. The third position test showed an improved motion and a variation of three seconds as per sixth column. The total time required for making the alterations was about three quarters of an hour.
[64.]Example No. 3, Three Positions.
Elgin No. 7457488. Open Face, 21 Jewels.
Repairs made. Cleaned; polished pivots and new mainspring fitted. The first position test showed a variation of nineteen seconds as per second column, Fig. 18.
It will be noted that this example differs from Nos. 1 and 2, in that the rate is slow in the pendant up position. Examination showed all points satisfactory except that the regulator pins were spread considerably and allowed too much freedom of vibration for the coil.
Had this vibration been slight it would have been advisable to examine the poise. As it was considerable, however, the alteration made was to close the pins so that only slight vibration was visible with a strong glass.
| No. ...7457488.......... Make...Elgin........... | |||||||
|---|---|---|---|---|---|---|---|
| D U | - 9 | - 9 | + 5 | + 5 | P | ||
| D D | -18 | - 9 | + 8 | + 3 | |||
| P U | -46 | -28 | + 9 | + 1 | |||
| 19 | 4 | ||||||
This watch was not equipped with mean time screws and it was therefore necessary to fit a pair of thin timing washers because closing the pins caused a gaining rate of two seconds per hour in the mean time. The next position test showed a variation of four seconds as per fourth column Fig. 18.
The time consumed in making the alteration and fitting the washers was about ten minutes.