This condition can be determined by observing if the
jewel seems to slide up (toward the pipe _C_) on the gold spring after
contact. Some adjusters set the jewel _J_, Figs. 143 and 141, in such a
way that the tooth rests close to the base; such adjusters claiming this
course has a tendency to avoid cockling or buckling of the detent spring
_E_. Such adjusters also set the impulse jewel slightly oblique, so as
to lean on the opposite angle of the tooth. Our advice is to set both
stones in places corresponding to the axis of the balance staff, and the
escape-wheel mobiles.
THE DETENT SPRING.
[Illustration: Fig. 144]
It will be noticed we have made the detent spring _E_ pretty wide and
extended it well above the blade of the detent. By shaping the detent in
this way nearly all the tendency of the spring _E_ to cockle is
annulled. We would beg to add to what we said in regard to setting
jewels obliquely. We are unable to understand the advantage of
wide-faced stones and deep teeth when we do not take advantage of the
wide surfaces which we assert are important.
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