Bar electromagnet [148]
Battery bell [115]
Battery symbols [114]
Blake single electrode [64]
Brazed bell [130]
Broken-back ringer [280]
Broken-line method of selective signaling [261], [275]
C
Capacity reactance [55]
Carbon [31]
adaptability [31]
limitations [33]
preparation of [75]
superiority [32]
Carbon air-gap arrester [300]
Carbon-block arrester [296]
Carrying capacity of transmitter [76]
Central-office protectors [310]
Characteristics of sound [19]
loudness [20]
pitch [20]
timbre [21]
Chloride of silver cell [113]
Closed-circuit cells [106]
Closed-circuit impedance coil [164]
Common-battery telephone sets [217]
Condensers [178]
capacity [178]
charge [178]
conventional symbols [184]
definition of [180]
dielectric [180]
dielectric materials [182]
functions [184]
means for assorting current [185]
sizes [183]
theory [179]
Conductivity of conductors [49]
Conductors, conductivity of [49]
Conventional symbols [91]
Cook
air-gap arrester [298]
arrester [311]
arrester for magneto stations [313]
Crowfoot cell [106]
Current supply to transmitters [186]
common battery [188]
advantages [188]
bell substation arrangement [192]
bridging battery with impedance coils [194]
bridging battery with repeating coil [191]
current supply from distant point [204]
current supply over limbs of line in parallel [200]
Dean substation arrangement [197]
double battery with impedance coil [195]
Kellogg substation arrangement [198]
North Electric Company system [199]
series battery [189]
series substation arrangement [190]
Stromberg-Carlson system [198]
supply many lines from common source [202]
repeating coil [202]
retardation coil [204]
local battery [187]
D
Dean
drop and jack [344]
receiver [88]
wall telephone hook [137]
Desk stand hooks [138]
Kellogg [140]
Western Electric [138]
Dielectric [180]
Dielectric materials [182]
dry paper [182]
mica [182]
Differential electromagnet [151]
Direct-current receiver [84]
Drainage coils [315]
E
Electric lamp signal [44]
Electrical hazards [287]
Electrical reproduction of speech [24]
carbon [31]
conversion from sound waves to vibration of diaphragm [21]
conversion from vibration to voice currents [24]
conversion from voice currents to vibration [25]
cycle of conversion [26]
detrimental effects of capacity [36]
early conceptions [28]
electrostatic telephone [30]
induction coil [34]
limitations of magneto transmitter [29]
loose contact principle [27]
magneto telephone [26]
measurements of telephone currents [36]
variation of electrical pressure [30]
variation of resistance [30]
Electrical signals [39]
audible [39]
magneto-bell [40]
telegraph sounder [39]
telephone receiver [43]
vibrating bell [40]
visible [43]
electric lamp signal [44]
electromagnetic signal [43]
Electrodes [75]
arrangement of [63]
carbon preparation [75]
multiple [65]
single [64]
Electrolysis [315]
Electromagnetic method of measuring telephone currents [37]
Electromagnetic signal [43]
Electromagnets and inductive coils [143], [171]
conventional symbols [171]
differential electromagnet [151]
direction of armature motion [151]
direction of lines of force [146]
electromagnets [143]
low-resistance circuits [147]
horseshoe form [147]
iron-clad form [149]
special horseshoe form [150]
impedance coils [163]
kind of iron [164]
number of turns [103]
types
closed-circuit [164]
open-circuit [164]
toroidal [165]
induction coil [165]
current and voltage ratios [166]
design [166]
functions [166]
use and advantage [167]
magnet wire [153]
enamel [156]
silk and cotton insulation [155]
space utilization [156]
wire gauges [154]
magnetic flux [144]
magnetization curves [145]
magnetizing force [143]
mechanical details [152]
permeability [144]
reluctance [147]
repeating coil [168]
winding methods [158]
winding calculations [162]
winding data [159]
winding terminals [159]
Electrostatic capacity [50]
unit of [52]
Electrostatic telephone [30]
Enamel [156]
F
Five-bar generator [123]
Fuller cell [109]
G