Cyclopedia of Applied Electricity: Telephony; IndexAmerican school of correspondence at Armour institute of technology, 1905 - Electric engineering |
Common terms and phrases
already described alternating current answering jack apparatus armature automatic binding post bolt brass bridged cable called subscriber calling subscriber's line carbon cell circuit trunks circular mils common battery system condenser conductors connected consists construction contact point copper cord circuit cross-arm current flows diameter direct current direction distance distributing board duct dynamo energized equipped exchange fastened feet ground hole hook switch inches induction coil insulation iron lamp listening key located lugs magnetic main distributing frame manhole manner metallic method mounted multiple jacks ohms order circuit passes placed pole position private branch exchange receiver repeating coil resistance retardation coil ringing key screw shank short circuit shown in Fig shunt side signal sleeve soldered spring station subscriber operator suspension wire switchboard telephone terminal tion toll board toll point toll trunks transmitter trouble trunk operator vibration voltmeter wave winding wire chief zinc
Popular passages
Page 385 - ... sections of this Cyclopedia numerous illustrative examples are worked out in detail in order to show the application of the various methods and principles. Accompanying; these are examples for practice which will aid the reader in fixing the principles in mind. In the following pages are given a large number of test questions and problems which afford a valuable means of testing the reader's knowledge of the subjects treated.
Page 5 - Correspondence has attained in teaching thousands of electricians, is in itself the best possible guarantee for the present work. Therefore, while these volumes are a marked innovation in technical literature — representing as they do the best ideas and...
Page 5 - Electric Railways, Theoretically and Practically Treated." Foreword IN view of the great need for a more scientific knowledge of electricity on the part of thousands of practical men of limited technical education, an attempt has been made in the following pages to give a presentation of the subject which shall be easily understood by such men, and at the same time cover all essential principles and methods.
Page 1 - Authorities Consulted THE editors have freely consulted the standard technical literature of America and Europe in the preparation of these volumes. They desire to express their indebtedness particularly to the following eminent authorities whose well-known works should be in the library of everyone connected with building.
Page 83 - Fig. 69. withdrawn, and the timher placed in a vacuum of 26 inches until the water and sap have been removed. The chamber containing the timber is next filled with the dead oil of tar at a temperature of not less than 120° F nor more than 250° F, and pressure is applied until the requisite amount of oil has been forced into the timber. -9 4^IQ
Page 141 - ... conduit, while at the other end is secured a rubber gasket b, having a diameter slightly larger than that of the interior of the duct. One of these mandrels is placed in each duct when the work of laying is begun. As the work progresses...
Page 16 - ... wave length. A wave length may be defined as the distance through which the pulse has traveled while the prong of the tuning fork has made one complete vibration, during which time each particle of air has gone through one complete cycle of changes, both as regards motion and density. The period of vibration to each particle is thus identical with the period of vibration of the prong of the tuning fork. It has been proven by experiment that the rate of sound traveling in air is 1,090 feet per...
Page 22 - The cover supports a carbon plate about 4 inches wide, 9 inches long, and one-fourth inch thick, with the top coated with paraffin to prevent the corrosion of the connection by the acid. In the jar stands an earthenware porous cup 7 '4 by 3 inches, in the bottom of which is placed about 2 ounces of mercury.