Now, if we should employ other material than
hammer-hardened brass for an escape wheel it would modify the thickness;
also, if we should decrease the motive power and increase the arc of
impulse. Or, if we should diminish the extent of the impulse arc and add
to the motive force, every change would have a controlling influence. In
the designs we shall employ, it is our purpose to follow such
proportions as have been adopted by our best makers, in all respects,
including form, size and material. We would say, however, there has been
but little deviation with our principal manufacturers of marine
chronometers for the last twenty years as regards the general principle
on which they were constructed, the chief aim being to excel in the
perfection of the several parts and the care taken in the several
adjustments.
Before we proceed to take up the details of constructing a chronometer
escapement we had better master the names for the several parts. We show
at Fig. 136 a complete plan of a chronometer escapement as if seen from
the back, which is in reality the front or dial side of the "top plate.
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