Although
pocket watches with duplex and cylinder escapements having balances
compensated for heat and cold and balance springs adjusted to
isochronism gave very good results, careful makers were satisfied that
an escapement in which the balance was detached and free to act during
the greater proportion of the arc of vibration and uncontrolled by any
cause, would do still better, and this led to the detent escapement.
FAULTS IN THE DETENT ESCAPEMENT.
As stated previously, the detent escapement having pronounced faults in
positions which held it back, it is probable it would never have been
employed in pocket watches to any extent if it had not acquired such a
high reputation in marine chronometers. Let us now analyze the
influences which surround the detent escapement in a marine chronometer
and take account of the causes which are combined to make it an accurate
time measurer, and also take cognizance of other interfering causes
which have a tendency to prevent desired results.
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