This category constitutes what is
known as the _detached escapement_ class.
Of the _recoil escapement_ the principal types are: the _verge
escapement_ or _crown-wheel escapement_ for both watches and clocks, and
the _recoil anchor escapement_ for clocks. The _cylinder_ and _duplex
escapements_ for watches and the _Graham anchor escapement_ for clocks
are styles of the _dead-beat escapement_ most often employed. Among the
_detached escapements_ we have the _lever_ and _detent_ or _chronometer
escapements_ for watches; for clocks there is no fixed type of detached
lever and it finds no application to-day.
THE VERGE ESCAPEMENT.
The _verge escapement_, called also the _crown-wheel escapement_, is by
far the simplest and presents the least difficulty in construction. We
regret that the world does not know either the name of its originator
nor the date at which the invention made its first appearance, but it
seems to have followed very closely upon the birth of mechanical
horology.
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