ABC of the Telephone: A Practical and Useful Treatise for Students and Workers in Telephony, Giving a Review of the Development of the Industry to the Present Date |
Other editions - View all
Common terms and phrases
alternating current ampere answering plug armature arrangement attached Bell instrument bell magnets binding post bridged button cable call bell call board calling plug calling subscriber carbon cell circular mils clearing-out drop common battery condenser connected copper cord core described device diagram diameter diaphragm drop and jack dynamo electro-magnet electrode electromotive force energy exchange farad feet full metallic ground inches induction coil inserted instrument insulated iron jack springs lamp leaf spring Leclanché cell length lever line wire magnet coils magneto-generator metallic circuit method multiple jack multiple switchboard ohms operator operator's ordinary pair plate pole position pressure primary receiver relay repeating coils resistance ringing circuit ringing key screw secondary winding seen selective signaling shown in Fig shows shunt shutter sound spring subscriber's apparatus switch hook talking battery talking circuit tele telephone apparatus telephonic current terminal thimble tion transmitter vibrations
Popular passages
Page 46 - As a unit of work, the joule, which is equal to 107 units of work in the CGS system, and which is represented sufficiently well for practical use by the energy expended in one second by an international ampere in an international ohm.
Page 18 - As in the simplest form of chemical cell this liquid is diluted sulphuric acid, whose components are two parts of hydrogen, one part of sulphur and four parts of oxygen (H2 SO4), the light end of each molecule represents H2, let us say, and the dark portion SO4.
Page 53 - Henry, which is the induction in a circuit when the electromotive force induced in this circuit is one international volt while the inducing current varies at the rate of one Ampere per second.
Page 348 - Steam Turbines, Pumping Machinery, Electrical Installations, Motors, Wiring, etc., Refrigerating Systems, Rules, Receipts. Metallic Compositions, Useful Tables. Ready Reference Index. By following this plan, and with the aid of the ready reference index to be found at the end of the volume, the work becomes a reference book, as well as a course of systematic study, in Mill Engineering. This volume is convenient in size, handsomely and durably bound in black cloth, having gold edges and titles ; containing...
Page 66 - Suppose that a man speaks near a movable disk, sufficiently flexible to lose none of the vibrations of the voice, and that this disk alternately makes and breaks the currents from a battery: you may have at a distance another disk, which will simultaneously execute the same vibrations.