Index P...

P.B.X.	Common-Battery System - Non-Multiple Switchboard
pads	Pads and Attenuators
PAM	Pulse Modulation
panel-type dial system	The Development of Telephone Service
parallel resonance	Parallel (Phase) Resonance
passive transmitters	Passive or Generator-Type Telephone Transmitters
PCM	Pulse Modulation
PDM	Pulse Modulation
penetration frequency	Penetration (Critical) Frequency
pentode	High-Vacuum Thermionic Five-Electrode Tubes
periodic antenna	Periodic Resonant Antennas
permalloy	Magnetic Materials Used in Communication
	Permalloys
permanent magnets	Permalloys
Perminvar	Permalloys
PFM	Pulse Modulation
phantom circuit	The Development of Telephone Service
	The Phantom Circuit
phantom group	Cables of Paired Twisted Wires
phantom-circuit	Loading Phantom Group Circuits
phase angle	The Cathode-Ray Oscilloscope
phase constant	Propagation Constant of a Transducer
	Propagation Constant
phase modulation	Frequency and Phase Modulation
phase relations	Phase Relations in Amplifiers
phase velocity	Rectangular Wave Guides
phasitron	Methods of Producing Frequency-Modulated Waves
pi section	Equivalence of T and Pi Sections
piezoelectric effect	The Crystal Microphone
piezoelectric motor element	Types of Motor Elements
pitch of the vowel sounds	The Frequency Characteristics of Speech
plunger type switch	Line Switches
PM	Frequency and Phase Modulation
pneumatic loudspeakers	Miscellaneous Receivers and Loudspeakers
polarization	Electromagnetic Waves
polarized ringer	Polarized Ringers or Bells
polarized telegraph relay	Polar Direct-Current Telegraph Systems
powdered iron	Permalloys
power	Power Output and Efficiency of Receivers and Loudspeakers
power amplifier	Voltage Amplification and Power Amplification
	Classifications of Power Amplifiers
	Radio-Frequency Power Amplifiers
	Neutralization
power level	Power Level and Volume
	Transmission Lines
power lines	Classification of Power Parallels
power of human voice	Speech Power
power transfer	Maximum Power Transfer
PPM	Pulse Modulation
pre-emphasis circuits	Frequency-Modulation Radio-Telephone Receivers
precipitation static	Precipitation Static
preface	Preface
printing telegraphy	Printing Telegraphy
	Start-Stop Printing Telegraphy
privacy equipment	Transoceanic Low-Frequency Radio-Telephone Systems
private branch exchange	Common-Battery System - Non-Multiple Switchboard
problems	Problems
	Problems
	Problems
	Problems
	Problems
	Problems
	Problems
	Problems
	Problems
	Problems
	Problems
	Problems
	Problems
propagation constant	Propagation Constant of a Transducer
	Transmitted Bands from Propagation Constant
	Electromagnetic Wave Propagation
	Propagation Constant
	Propagation Constant of Radio-Frequency Transmission Lines
	Propagation Constant and Characteristic Impedance of a Cable
Protection	Principles of Plant Protection
proximity effect	Constants of Open-Wire Lines at Low Frequencies
	Linear Electrical Constants of Cables
PTM	Pulse Modulation
pulse modulation	Pulse Modulation
pulse-amplitude modulation	Pulse Modulation
pulse-code modulation	Pulse Modulation
pulse-duration modulation	Pulse Modulation
pulse-frequency modulation	Pulse Modulation
pulse-position modulation	Pulse Modulation
pulse-time modulation	Pulse Modulation