130. Any
adjustment or moving back and forth of the chariot to change the depth
could only be demanded where there was some fault existing in the
cylinder or where it had been moved out of its proper place by some
genius as an experiment in cylinder depths. It will be evident on
observing the drawing at Fig. 131 that when the cylinder is performing
an arc of vibration, as soon as the entrance lip has passed the point
indicated by the radial line _e x_ the point of the escape-wheel tooth
will commence to act on the cylinder lip and continue to do so through
an arc of forty degrees, or from the lines _x_ to _l_.
MAKING A WORKING MODEL.
To practically study the action of the cylinder escapement it is well to
make a working model. It is not necessary that such a model should
contain an entire escape wheel; all that is really required is two teeth
cut out of brass of the proper forms and proportions and attached to the
end of an arm 4-7/8" long with studs riveted to the U arms to support
the teeth.
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