Part 10 (2/2)
P R
+22
+18
+12
+ 4
+--------+-----+-----+-----+-----+-----+-----+
P L
+20
- 2
+ 8
- 4
+--------+-----+-----+-----+-----+-----+-----+-----+ 20 8
After correcting the roller jewel shake and readjusting the slide and guard pin freedom the next test showed a variation of eight seconds in the five positions as per fourth column Fig. 20. The side shake of the balance pivots was not detrimental after the real cause of the variation had been removed and therefore no correction was required in this respect.
If the error in the escapement had not existed and if the watch had shown the same rate with all points appearing to be satisfactory, the trouble would most likely have been found in the poise of balance with the upper side heavy in the pendant right position.
The time consumed in making the correction was about one half hour.
68. _Example No. 6._
Elgin. B. W. Raymond. No. 4,109,543, Open Face, 15 Jewels.
Repairs made. New fourth pinion; new end stone; mainspring; refinished balance pivots and cleaned. Note that this was only a 15-Jewel watch.
It belonged to a railroad engineer, however, who wanted it placed in first cla.s.s condition, as it had not been satisfactory. The first five position test showed an error of twenty-four seconds as per second column Fig. 21.
Examination of the motion, pivots, regulator pins, escapement and poise proved them to be satisfactory.
The hairspring however, was found to be pinned at the slow pendant up point as per ill.u.s.tration in Fig. 22.
Fig. 21
+--------------------------------------------------+
No. _4109543_ Make _Elgin_
+--------+-----+-----+-----+-----+-----+-----+-----+
D U
+ 8
+ 8
+ 2
+ 2
P
+--------+-----+-----+-----+-----+-----+-----+
D D
+16
+ 8
+ 3
+ 1
+--------+-----+-----+-----+-----+-----+-----+
P U
0
-16
+ 2
- 1
+--------+-----+-----+-----+-----+-----+-----+-----+
P R
+ 4
+ 4
- 1
- 3
+--------+-----+-----+-----+-----+-----+-----+-----+
P L
- 1
- 5
- 6
- 5
+--------+-----+-----+-----+-----+-----+-----+-----+ 24 7
The alteration made was to break out one-half of the inner coil at collet so that it was pinned at the fast point as ill.u.s.trated in Fig. 23.
A pair of balance screws were removed and a heavier pair fitted to correct the mean time, which would have been about ten minutes fast in twenty-four hours because of shortening the spring.
The balance was repoised and the next test in positions showed a variation of seven seconds as per fourth column Fig. 21.
The time required for making the alteration was about one half hour.
[Ill.u.s.tration: Fig. 22]
[Ill.u.s.tration: Fig. 23]
This watch was a full plate model with the train developing to the left from the center and ill.u.s.trations No. 22 and 23 are given to show that, while the train follows the Swiss development, the spring follows the American method and develops to the right from the collet even though it is located to the left of the watch center. The principle remains the same as that ill.u.s.trated by Figs. 9 and 11 and explained in Chapter VIII.
69. _Example No. 7._
Waltham. No. 10504112. Open Face, Vanguard model, 23 Jewels.
Repairs made. Cleaned and new hole jewel.
First five position test showed a very erratic rate as per second column Fig. 24.
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