Читать книгу Philipp Reis: Inventor of the Telephone - Silvanus P. Thompson - Страница 18

Fig. 20.

Later a shallow rectangular wooden box was substituted for the violin, and the spiral was laid horizontally upon it (Fig. 20). The date when this modification was made was either at the end of 1861 or the early spring of 1862. A cigar-box was the actual sounding-box, and the needle was supported within the coil, but not touching it, with its ends resting upon two wooden bridges.