A popular sketch of electro-magnetism, or electro-dynamicsElliott Brothers, sucessors to Watkins & Hill, 1856 - 84 pages |
Other editions - View all
A Popular Sketch of Electro-Magnetism, Or Electro-Dynamics Francis Watkins No preview available - 2018 |
A Popular Sketch of Electro-Magnetism, Or Electro-Dynamics Francis Watkins No preview available - 2015 |
Common terms and phrases
action Ampère antimony apparatus Fig Architect's Scale arrangement attached attracted axis bar magnet Beam Compass binding screws bismuth brass centre chemical affinity circuit circular Compass conducting wire conductor consists contact breaker current moves current of electricity current passes cylinder deflection effect elec electric current electrified Electro-Magnetic Machine Electrometer electroscope employed exhibits experiment Faraday fluid force former frame galvanometer glass tube glass vessel Grove's helix horseshoe magnet inch in diameter inches Ditto ditto induced insulated copper wire iron wire latter lower magnetic meridian magnetic needle Magneto-electric mercury cups motion needle telegraph north pole opposite directions oscillations pair particles piece placed plates platinum wire polarity position pounds weight produced quantity of electricity repelled repulsion resinous rotation shown in Fig silk silver soft iron soldered steel sulphuric acid suspended telegraph Theodolite thermo-electric tion tricity troughs vertical voltaic battery Watkins wood wooden zinc دو
Popular passages
Page 76 - ... thin band or string it makes an excellent insulating suspender : a piece of it in sheet makes a most convenient insulating basis for anything placed on it. It forms excellent insulating plugs for the...
Page 44 - Despretz, 6 pounds weight of zinc, in combining with oxygen, develope no more heat than one pound of coal ; consequently, under equal conditions, we can produce six times the amount of force with a pound of coal as with a pound of zinc.
Page 1 - Essay is, that the various affections of matter which constitute the main objects of experimental physics, viz., heat, light, electricity, magnetism, chemical affinity, and motion, are all correlative, or have a reciprocal dependence. That neither, taken abstractedly, can be said to be the essential or the proximate cause of the others, but that either may, as a force, produce the others : thus heat may mediately or immediately produce electricity, electricity may produce heat; and so of the rest...
Page 4 - I think I shall not be unsupported by many who have attentively studied electrical phenomena, in viewing them as resulting not from the action of a fluid or fluids, but as a molecular polarization of ordinary matter, or as matter acting by attraction and repulsion in a definite direction.
Page 1 - ... the others : thus heat may mediately or immediately produce electricity, electricity may produce heat ; and so of the rest, each merging itself as the force it produces becomes developed : and that the same must hold good of other forces, it being an irresistible inference from observed phenomena that a force cannot originate otherwise than by devolution from some pre-existing force or forces.
Page 72 - That for a constant quantity of electricity, whatever the decomposing conductor may be, whether water, saline solutions, acids, fused bodies, &$c., the amount of electro-chemical action is also a constant quantity, ie would always be equivalent to a standard chemical effect founded upon ordinary chemical affinity.
Page 40 - ... sound is that which is obtained by stretching upon a soundingboard well annealed wires, one or two twentieths of an inch in diameter and a yard or two in length. They are placed in the axis of one or several bobbins, the wires of which are traversed by electric currents, and they produce an assemblage of sounds, the effect of which is surprising, and which greatly resembles that to which several church bells give rise when vibrating harmonically in the distance.
Page 51 - Office, Lothbury, London. It flows under the streets of the great metropolis, and, passing on wires suspended over a zigzag series of railways, reaches Edinburgh, where it dips into the earth, and diffuses itself upon the buried plate. From that it takes flight through the crust of the earth, and finds its own way back to the cellars at Lothbury!!!
Page 56 - On placing the wire perpendicularly, and bringing a needle towards it to ascertain the attractive and repulsive positions with regard to the wire ; instead of finding these to be four, one attractive and one repulsive for each pole...
Page 44 - ... in the galvanic pile, we should produce steam, and by it a certain amount of force. If we should assume (which, however, is not proved) that the quantity of force is unequal in these cases, — that, for instance, we had obtained double or triple the amount in the galvanic pile, or that in this mode of generating force less loss is sustained, — we must still recollect that zinc can be represented by an equivalent weight of carbon (as coal).