Citations:cymatograph


 * 1885, Nature XXXII, page 279
 * In the course of the evening a lantern exhibition of polariscopic objects was given in the Physical Lecture Theatre by Prof. S. P. Thompson, who had also lent for exhibition various telephones, a phonograph, an “electric light compass” for detecting the direction of a current in a wire, a “cymatograph” (an instrument for compounding the resultant of two parallel, simple, harmonic waves), and a collection of historical electric-telegraph apparatus.