This section is from the book "The Home Cyclopedia Of General Information", by Charles Morris. Also available from Amazon: Home Cyclopedia of Necessary Knowledge.
A simple instrument of music, made of metal, and shaped like a harp. When played it is placed between the teeth, and by means of a little spring, which is made to vibrate by being struck with the finger, it produces a sound which is modulated by the breath of the performer into soft melody. Also called Jew's-trump.
 
Continue to: