Modern Practice of the Electric Telegraph: A Technical Handbook for Electricians, Managers, and Operators, with 185 IllustrationsD. Van Nostrand Company, 1891 - 234 стор. |
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Modern Practice of the Electric Telegraph. a Handbook for Electricians and ... Frank L. Pope Попередній перегляд недоступний - 2019 |
Modern Practice of the Electric Telegraph; a Technical Handbook for ... Frank L. (Franklin Leonard) Pope Попередній перегляд недоступний - 2012 |
Загальні терміни та фрази
action adjustment ampère-turns ampères apparatus armature battery brass centimetre closed coil conductivity conductor connected convenient copper plate copper wire cross-section Daniell cell deflection diagram diameter direction distant end distant station dots dynamo Dynamo-Electric earth effect electric circuit electric current electric telegraph electro-magnet electromotive force equal gauge glass gravity cell ground helix hence hydrometer Illustrated instrument insulation leaky line length lever line-wire lines of force loop magnetic field magnetic force magnetic needle metallic miles number of cells number of turns Ohm's law ohms operator pegs placed pole position potential practical principle produced proportion quadruplex quantity of current ratio resistance rheostat ring s. c. solution screws shown in Fig signals single-current soft iron sounder sulphate switch Tangent Galvanometer telegraph line telegraphic circuit termed terminal station thick tion transmitting unit usually voltaic voltaic cell volts Wheatstone Bridge zinc zinc plate
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Сторінка 36 - In physical science a first essential step in the direction of learning any subject is to find principles of numerical reckoning and methods for practically measuring some quality connected with it. I often say that when you can measure what you are speaking about and express it in numbers, you know something about it ; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory...