After the locking jewel _c_ is set, we can set the
foot _F_ of the detent _D_ forward or back, to perfect and correct the
engagement of the escape-wheel teeth with the impulse roller _B_. If we
set this too far forward, the tooth _A^3_ will encounter the roller
while the tooth _A^2_ will be free.
We would beg to say here there is no escape wheel made which requires
the same extreme accuracy as the chronometer, as the tooth spaces and
the equal radial extent of each tooth should be only limited by our
powers toward perfection. It is usual to give the detent a locking of
about two degrees; that is, it requires about two degrees to open it,
counting the center of fluxion of the detent spring _E_ and five degrees
of balance arc.
FITTING UP OF THE FOOT.
Several attempts have been made by chronometer makers to have the foot
_F_ adjustable; that is, so it could be moved back and forth with a
screw, but we have never known of anything satisfactory being
accomplished in this direction.
Pages:
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290