Make one string to sound, and its vibrations will, with much force,
be transferred to the next string: this transference may be seen by
placing a saddle of paper (like an inverted v, Λ) upon the
string, at first in a state of rest. When this string _hears_ the
other, the saddle will be shaken, or fall off; when both strings are in
harmony, the paper will be very little, or not at all, shaken.