ADDITIONAL PREFERENCES CONCERNING REIS’S TELEPHONE.

Schenk’s Philipp Reis, der Erfinder des Telephons, 1878.

Sack’s Die Entwickelung der elektrischen Telephonie, 1878.

Ferguson’s Electricity (Ed. 1867), p. 257.

Wiedemann’s Galvanismus (1874), Vol. ii. p. 598.

Gartenlaube, die; for 1863, No. 51, p. 807-809.

Aus der Natur; for 1862, xxi. p. 470-474.

Cosmos, Vol. xxiv. p. 349 (1864).

Proc. Lit. Phil. Soc. Manchester (1865), Nov. 10, 1864.

Rep. Brit. Assoc. (1863), p. 19.

Die Geschichte und Entwickelung des elektrischen Fernsprechwesens, 1880. (Officially issued from the Imperial German Post-Office, Berlin.)

LONDON: PRINTED BY WILLIAM CLOWES AND SONS, LIMITED, STAMFORD STREET AND CHARING CROSS.

Plate 1. REPRODUCTION OF TONES IN THE ELECTRO-GALVANIC WAY.

THO^s. KELL & SON. LITH 40, KING S^t. COVENT GARDEN

REPRODUCTION OF TONES IN THE ELECTRO-GALVANIC WAY.

THO^s. KELL & SON. LITH 40, KING S^t. COVENT GARDEN