## The Electrician's Pocket-book: The English Edition of Hospitalier's "Formulaire Pratique de L'électricien;" |

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### Contents

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### Common terms and phrases

action Amalgamated amperes angle apparatus armature arranged bath battery C. G. S. unit cable calories capacity carbon carcels cell cent centimetre charge Chatterton's compound chloride coil condenser conductor constant copper wire coulombs current passing current strength deflection deposit diameter difference of potential direction dynamo Electrical efficiency electrical energy electro-magnet electrolysis electromotive force elements equal field magnets formula galvanometer Gramme machine grammes guttapercha heat horse-power induction instrument insulation internal resistance iron kilogrammes kilogrammetres kilometre lamps length lines of force litres machine magnetic field magnetised Marcel Deprez mean measured mechanical mercury metal method metres millimetres minute motor needle nitric acid number of turns ohms plate platinum pole practical produced proportional quantity of electricity resistance box revolutions per minute shunt Siemens silver solder solution specific resistance square Strength of current sulphate of copper sulphuric acid tangent galvanometer temperature thick varies voltmeter volts weight Wheatstone's bridge zinc sulphate

### Popular passages

Page 6 - The force of attraction or repulsion between two point charges is directly proportional to the product of the charges and inversely proportional to the square of the distance between them.

Page 42 - A current of unit intensity is such that when one centimetre length of its circuit is bent into an arc of one centimetre radius, it exerts a force of one dyne on a unit magnetic pole placed at its center. Electromotive Force.

Page 36 - ... force which, acting on a mass of 1 gramme for 1 second, gives it a final velocity of 1 centimetre per second.

Page 145 - Hence the radius of gyration may be defined as the distance from the axis of rotation, at which the whole mass of the body must be supposed concentrated, in order that the energy of rotation may be the same as it is actually.

Page 21 - ... needle. The coil is then turned until it overtakes the needle, which once more lies parallel to the coil. Two forces are now acting on the needle and balancing each other, viz., the directive force of the earth's magnetism, and the deflecting force of the current flowing through the coil. At this moment, the strength of the current is proportional to the sine of the angle through which the coil has been turned. The values of the sines may be obtained from a table of natural sines. Such a table...

Page 10 - The law that the strength or intensity of an unvarying electrical current is directly proportional to the electromotive force, and inversely proportional to the resistance of the circuit. The law does not hold for alternating currents unless modified so as to include the effects of counter electromotive force.

Page 15 - The amount of an ion liberated at an electrode in one second is equal to the strength of the current multiplied by the " electro-chemical equivalent

Page 29 - ... the mass of one cubic centimetre of distilled water at the temperature of 4°...

Page 15 - Summing up, the heat produced in a conductor is proportional to the resistance of the conductor, to the square of the current, and to the time.

Page 25 - Fig. 1133 illustrates a case of circular motion which differs in many features from the first two considered. Here the lines of force are parallel to each other and at right angles to the axis of rotation ; consequently, the angle between the direction of motion and the direction of the lines of force changes at every instant. From this it follows that the EMF also varies during successive instants. Although the direction of motion of the conductor changes, at any one point it may be considered to...