ORIGINAL DESIGNING OF THE ESCAPEMENT.
On delineating our chronometer escapement shown at Fig. 141 we have
followed no text-book authority, but have drawn it according to such
requirements as are essential to obtain the best results. An escapement
of any kind is only a machine, and merely requires in its construction a
combination of sound mechanical principles. Neither Saunier nor Britten,
in their works, give instructions for drawing this escapement which will
bear close analysis. It is not our intention, however, to criticise
these authors, except we can present better methods and give correct
systems.
TANGENTIAL LOCKINGS.
It has been a matter of great contention with makers of chronometer and
also lever escapements as to the advantages of "tangential lockings." By
this term is meant a locking the same as is shown at _C_, Fig. 141, and
means a detent planted at right angles to a line radial to the
escape-wheel axis, said radial line passing through the point of the
escape-wheel tooth resting on the locking jewel.
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