are set twice.

The over-strung bass usually has but two strings to a unison and only
one mute is needed. In the extreme low or contra-bass, pianos have but
one string, in tuning which the mute is discarded. Set the mute as
indicated by the figures 1, 2, 3, etc., in the diagram below, always
tuning the string farthest to the right by its octave above; then move
the mute to its next place and tune the left string by the right.
Here, again, you tune two strings every time you reset your mute. The
I's represent bass strings.

9 8 7 6 5 4 3 2 1
I I I I I I I II II II II II II II II II
C C♯ D D♯ E F F♯ G G♯ A A♯ B C
Contra-Bass. Bass. Treble.


SETTING THE MUTES IN THE SQUARE PIANO.

In setting the temperament in the square piano, simply mute the string
farthest to the left and tune the one to the right until the
temperament is finished, then set the mutes in the bass the same as in
the upright. In tuning the treble, if the piano has three strings, the
same system is used as has been described for the upright. When the
piano has but two strings to a unison, as is usually the case, employ
the system described for the bass of the upright, but reversed, as you
are proceeding to the right instead of to the left.

Remove the shade before beginning to tune a square piano, and if
necessary, lay the dampers back and trace the strings to their pins so