Text: Musical instruments of this material are of two kinds, percussion and friction; the first consists of a series of small plates of graduated sizes, supported on tapes secured in a wooden box, the several tones being regulated by the size of the glass; this is a mere toy. For a description of the best of the second class see HARMONICA. Another form of a glass friction instrument is made of a number of tubes of various lengths, and as the tone is brought out by stroking the length of the several tubes with flannel or india rubber, it is only capable of producing slow melodies.

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Source: 125