This permits the composition of one line,
the casting of another, and the distribution of a third to proceed
simultaneously.
ASSEMBLING AND KEYBOARD MECHANISMS
The matrices pass through the magazine by gravity. Their release is
effected by mechanisms shown in Figs. 5 and 6, which are vertical
sections through the magazine, the keyboard, and intermediate
connections. Under each channel of the magazine, there is an escapement
_B_, consisting of a small lever rocking at its centre on a horizontal
pivot, and carrying at its opposite ends two dogs or pawls _b, b_, which
are projected up alternately into the magazine by the motion of the
lever. The key-rod _C_, suspended from the rear end of the escapement
_B_, tends to hold the lower pawl _b_ in an elevated position, as shown
in Fig. 5, so that it engages under the upper ear of the foremost matrix
to prevent its escape.
[Illustration: Fig. 5.]
When the escapement _B_ is rocked, it withdraws the lower pawl _b_, as
shown in Fig. 6, at the same time raising the upper pawl, so that it
engages and momentarily arrests the next matrix.
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