Dynamo-electricity: Its Generation, Application, Transmission, Storage and MeasurementD. Appleton, 1884 - 867 pàgines |
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Dynamo-electricity: Its Generation, Application, Transmission, Storage and ... George Bartlett Prescott Visualització completa - 1884 |
Dynamo-electricity: Its Generation, Application, Transmission, Storage and ... George Bartlett Prescott Visualització completa - 1884 |
Dynamo-electricity: Its Generation, Application, Transmission, Storage and ... George Bartlett Prescott Visualització completa - 1890 |
Frases i termes més freqüents
action adjusted alternating currents ampères apparatus ARC LAMP arrangement attached axis bars battery binding post brass brushes candle carbon holder carbon rod carbon-holder cell coils commutator conductors connected consists construction current passes cylinder deflection diameter direction disk distance dynamo dynamo-electric machine Edison effect electric current electric light electro motive force electro-magnet electro-motive force employed energy field magnets figure filament fixed galvanometer Gramme machine heat horizontal horse power incandescent lamps inches increase insulated iron core latter length lever lower carbon magnetic field main circuit means measured mechanism metal motion motor movable move needle obtained ohms placed plates platinum polarity position produced pulley regulator rent resistance revolving rheostat ring rotation screw shaft shown in fig shunt side Siemens soft iron solenoid spring strength tangent galvanometer temperature terminals thick tion tube upper carbon vertical voltaic arc volts Weston wheel wire coil wound zinc
Passatges populars
Pàgina 254 - The same quantity of electricity which, passed in a given time, can heat an inch of platina wire of a certain diameter red hot, can also heat a hundred, a thousand, or any length of the same wire to the same degree, provided the cooling circumstances are the same for every part in all cases.
Pàgina 760 - The quality of the conductor in virtue of which it prevents the performance of more than a certain amount of work in a given time by a given electromotive force is called its electrical resistance. The resistance of a conductor is therefore inversely proportional to the work done in it when a given electromotive force is maintained between its two ends...
Pàgina 755 - Gauss' principle of absolute measurement for magnetism and electricity, is merely an extension of the astronomer's method of reckoning mass in terms of what we may call the universalgravitation unit of matter; and of the reckoning of force adopted by astronomers, in common with all workers in mathematical dynamics, according to which the unit of force is that force, which, acting on unit of mass for unit of time, generates a velocity equal to unit of velocity.
Pàgina 102 - ... and the rod R, supporting the positive electrode. The magnet, m, is placed as shown by the dotted lines, in the circuit which produces the light. The pillar...
Pàgina 6 - ... particles can be rendered visible to a large number of spectators by throwing an image of the heated points on a screen with the aid of a lens. Fig. 510 represents the image thus obtained, the natural size of the carbons being indicated by the sketch at the right hand. On watching the image for some time, incandescent particles will be observed traversing the length of the arc, sometimes in one direction and sometimes in the other, the prevailing direction being, however, that of the positive...
Pàgina 100 - In practice, instead of vibrating both electrodes, we have found it necessary to give motion to but one, and since the negative electrode may be made of such size as to waste very slowly, motion is imparted to it, in preference to the positive. The carbon electrodes may be replaced by those of various substances of sufficient conducting power. In this system, when desired, an independent battery circuit is employed to control the extinction and lighting of each lamp. " The following is a description...
Pàgina 720 - Portrush with Bush Mills, in the north of Ireland, in the installation of which I have been aided by Mr. Traill, as engineer of the Company, and by Mr. Alexander Siemens, and Dr. E. Hopkinson, representing my firm. In this instance the two rails, 3 feet apart, are not insulated from the ground, but being joined electrically by means of copper staples they form the return circuit, the current being conveyed to the car through a T iron placed upon short standards, and insulated by means of insulite...
Pàgina 70 - It is evident, indeed, that no determinations made with an unknown or abnormal external resistance can be of any value, since the proportion of work done, in the several portions of an electrical circuit, depends upon, and varies with, the resistances they offer to its passage. If, therefore...
Pàgina 102 - When the electrodes are in contact the current circulating through m renders it magnetic, and attracts the armature, a, thus separating the electrodes ; when, on the weakening of the current, the elasticity of the rod, b, again restores the contact. During the movement of the negative electrode, since it is caused to occur many times...
Pàgina 100 - ... system, one or both of the electrodes, which may be the ordinary carbon electrodes, are caused to vibrate to and from each other. The electrodes are placed at such a distance apart that in their motion toward each other they touch, and afterward recede a distance apart, which can be regulated.