Читать книгу Philipp Reis: Inventor of the Telephone - Silvanus P. Thompson - Страница 14

Our knowledge of this form is derived solely from information and sketches supplied by Mr. E. Horkheimer, who assisted Reis in its construction. Figs. 15 and 16 are engraved after Mr. Horkheimer’s sketches. The conical mouthpiece was of wood: the contact pieces of platinum. The point c was attached to a springy slip of brass, g, fixed across the wooden box; and the adjusting-screw, h, served to regulate the degree of initial pressure at the point of contact which controlled the current.