the "back catch" (the backward projection of the
butt), at a short distance from the string in its return, and prevent
the hammer from falling entirely back to its rest position, thereby
preventing quick repetition.

_Bl_, bridle. This is a piece of tape about an eighth of an inch wide
with a piece of leather glued to the end and a hole near the end for
the point of the "stirrup" or bridle wire. The cut shows where the
bridle is fastened in the hammer butt by being put into the hole in
the butt, and the back catch stem covered with glue and driven in by
it which precludes all possibility of its coming loose. The bridle
passes through a hole in the lower part of the back catch. Its purpose
is to assist the hammer to return quickly by hanging to it with the
weight of the wippen, extension, jack, etc., when the key is released.
Thus the bridle becomes the main factor in the matter of quick
repetition.

_Bl W_, bridle wire, screwed into wippen, bent in the shape of a
buckle at top to hold bridle.

_Bt_, butt; or, more specifically, hammer butt. In some cheap actions
the butt is joined to its flange _g_, by the means described under the
head of wippen flange; but in this action the center-pin is held
firmly in the butt by a small strip of brass containing a set screw;
somewhat obscure in the cut, but discernible. As explained elsewhere,
all center-pins turn in the flange and not in the middle part.

_HS_, hammer shank in rest position.

_H_, hammer showing wood body or head, and covering of two layers of
felt.

_H R_, hammer rail, resting on felt cushion, _c_, glued to rail or
bracket. The hammer rail is held in position by the rod, shown under
the hammer shank, which is hinged to the bracket at the lower end, and
which allows it to be moved forward when the soft pedal is used. The
soft pedal communicates with this rail by a rod which moves it forward
and thereby shortens the stroke of the hammers and produces a softer
tone.

_sr_, spring rail screwed to the brackets. This rail supports the
light wire springs which assist the hammers in returning to rest
position.

_S_, string.

_D_, is the damper head secured to the damper wire by a set screw.

_DL_, damper lever, working in damper flange _g_, which is screwed to
main rail.

_s_, spoon; so called from its shape. It is screwed into the wippen.
When the key is struck, the motion on the wippen throws the spoon
forward, pushing the lower end of damper lever for