Note 10 — RESEARCHES IN ELECTRIC TELEPHONY.
Reading edition
Elie Wartmann. Comp. Rend. xxii. p. 544; Phil. Mag. (3d series), xxviii. p. 544; Arch. d. Sc. Phys. et Nat. (2d series), i. p. 419; Inst. 1846, p. 290; Monatscher. d. Berl. Akad. 1846, p. 111.