Galvani [92]
Generator armature [119]
Generator cut-in switch [125]
Generator shunt switch [124]
Generator symbols [127]
Granular carbon [66]
Gravity cell [106]
H
Hand receivers [90]
Harmonic method of selective signaling [248]
advantages [258]
circuits [257]
in-tune system [253]
limitations [258]
principles [248]
tuning [250]
under-tune system [250]
Head receivers [90]
Heat coil [306]
Holtzer-Cabot arrester [300]
Hook switch [132]
automatic operation [133]
contact material [135]
design [134]
desk stand hooks [138]
Kellogg [140]
Western Electric [138]
purpose [132]
symbols [141]
wall telephone hooks [135]
Dean [137]
Kellogg [135]
Western Electric [136]
Horseshoe electromagnet [148]
Human ear [23]
Human voice [22]
I
Impedance coils [163]
kind of iron [164]
number of turns [163]
symbols of [165]
types
closed-circuit [164]
open-circuit [164]
toroidal [165]
Inductance vs. capacity [56]
Induction coil [34], [165]
current and voltage ratios [166]
design [166]
functions [166]
use and advantage [167]
Inductive neutrality [174]
Inductive reactance [55]
Insulation of conductors [56]
Introduction to telephony [11]
Iron-clad electromagnet [149]
Iron wire ballast [177]
K
Kellogg
air-gap arrester [299]
desk stand hook [140]
drop and jack [342]
receiver [83]
ringer [129]
transmitter [70]
wall telephone hook [135]
L
Lalande cell [112]
Lamp filament [176]
Le Clanché cell [99]
Lenz law [54]
Line signals [325]
Lines of force, direction of [146]
Loading coils [59]
Lock-out party-line systems [263]
broken-line method [275]
operation [282]
Poole system [264]
step-by-step system [267]
Loudness of sound [20]
Low-reluctance circuits [147]
horseshoe form [147]
iron-clad form [149]