2. Considering the wippen and its attachments as one part, how
many parts move when a key is struck in the upright piano? How
many in the square?

3. Name the parts found in the upright action that are absent in
the square.

4. Describe the three methods by which soft tone is obtained from
use of soft pedal in the three types of actions.

5. What rail serves two purposes in the square action, and what
are they? What rail serves two purposes in the grand action, and
what are they?




LESSON V.

~REGULATING AND REPAIRING.~

FAULTS IN PIANOS, ASIDE FROM THE ACTION, AND THEIR REMEDIES.


One of the most common, and, at the same time, most annoying
conditions both to the owner of the piano and the tuner, is the
"sympathetic rattle." This trouble is most usual in the square and the
grand pianos and is generally due to some loose substance lying on the
sound board. The rattle will be apparent only when certain keys are