Carl Engel, Musical Instruments [1908]
“ About the tenth century a string for a fifth tone was added. The strings were made of silk neatly twisted. The neck of the instrument was provided with frets of string, which were carefully regulated according to the system of seventeen intervals in the compass of an octave before mentioned. Other favourite stringed instruments were the tamboura, a kind of lute with a long neck, and the quanūn, a kind of dulcimer strung with lamb’s gut strings (generally three in unison for each tone) and played upon with two little plectra which the performer had fastened to his fingers. ”
