Summary

Kathleen Schlesinger 1911 Encyclopædia Britannica, Volume 20… (1911)

Independently of the rich harmonics composing the clang, the bell has two distinct simultaneous notes, first the tap tone, which gives the pitch, and the hum tone or lower accompanying note. On the interval separating the hum from the tap tone depend the dignity and beauty of the bell tone and the emotional atmosphere produced. A stringed instrument, similar to the one here described but with four notes only, was used at Bayreuth for the first performance of Parsifal, and with it tam-tams or gongs, but after many trials the following combination was adopted as the best makeshift
Source: Wikisource

Kathleen Schlesinger 1911 Encyclopædia Britannica, Volume 20… (1911)

Two belly bridges and two wrest-plank bridges, one set for each octave, determine the vibrating length of the strings, and the belly bridge, as in other stringed instruments, is the medium through which the vibrations of the strings are communicated to the soundboard. The arrangement of pegs and wrest-pins is much the same as on the piano.
Source: Wikisource

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