Note 3 — RESEARCHES IN ELECTRIC TELEPHONY.
Reading edition
J. P. Marrian. Phil. Mag. xxv. p. 382; Inst. 1845, p. 20; Arch. de l’Électr. v. p. 195.
Reading edition
J. P. Marrian. Phil. Mag. xxv. p. 382; Inst. 1845, p. 20; Arch. de l’Électr. v. p. 195.