Elementary Lessons in Electricity & Magnetism |
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Page 8
... will show no electrification at all , the two equal and opposite electrifica- tions having exactly neutralized each other . A simple experiment consists in rubbing together a disk of sealing- wax 8 ELECTRICITY AND MAGNETISM PART I.
... will show no electrification at all , the two equal and opposite electrifica- tions having exactly neutralized each other . A simple experiment consists in rubbing together a disk of sealing- wax 8 ELECTRICITY AND MAGNETISM PART I.
Page 9
... disk be inserted in the pot the leaves of the electroscope will diverge ; but if both are inserted at the same time the leaves do not diverge , showing that the two charges on the disks are equal and of opposite sign . In the following ...
... disk be inserted in the pot the leaves of the electroscope will diverge ; but if both are inserted at the same time the leaves do not diverge , showing that the two charges on the disks are equal and of opposite sign . In the following ...
Page 11
... disks- A cov- ered with woollen cloth , B of some resinous body , - which have been rubbed to- gether so that A has become positively , B negatively elec- trified . In Fig . 6 the sur- faces are marked with plus ( + ) and minus ...
... disks- A cov- ered with woollen cloth , B of some resinous body , - which have been rubbed to- gether so that A has become positively , B negatively elec- trified . In Fig . 6 the sur- faces are marked with plus ( + ) and minus ...
Page 23
... disks oppositely electrified with given charges , and placed near together , does not vary with the distance . - 20. Field between two Balls . The electric field ( Art . 13 ) between two oppositely electrified balls is found to consist ...
... disks oppositely electrified with given charges , and placed near together , does not vary with the distance . - 20. Field between two Balls . The electric field ( Art . 13 ) between two oppositely electrified balls is found to consist ...
Page 29
... disk of slightly smaller diameter made of metal , or of wood covered with tinfoil , and provided with a glass handle . Shellac , or sealing - wax , or a mixture of resin , shellac , and Venice turpentine , may be used to make the cake ...
... disk of slightly smaller diameter made of metal , or of wood covered with tinfoil , and provided with a glass handle . Shellac , or sealing - wax , or a mixture of resin , shellac , and Venice turpentine , may be used to make the cake ...
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Common terms and phrases
acid action alternate currents amperes angle anode armature attracted ball battery capacity carbon cell centimetres chemical circuit coil condenser conductor copper current flows curve deflexion diamagnetic dielectric difference of potential direction discharge disk distance dynamo dynes earth electric force electrified electrified body electrolytic electromagnet electrometer electromotive-force electroscope electrostatic energy equal galvanometer glass gramme heat Hence hydrogen induction influence machine instrument insulated internal resistance inversely kathode knob lamp length LESSON Leyden jar light lines of force liquid machine magnetic field magnetic force magnetic lines magnetic pole measure metal method motor move N-seeking needle negative Ohm's law ohms opposite oscillations pass piece placed plate platinum polarization positive produced proportional quantity of electricity repelled rotation round rubbed self-induction shown in Fig spark sphere steel strength substances sulphate surface temperature tend thin tion tricity tube turns voltage volts zinc
Popular passages
Page 585 - As a unit of current, the international ampere, which is onetenth of the unit of current of the CGS system of electromagnetic units, and which is represented sufficiently well for practical use by the unvarying current which, when passed through a solution of nitrate of silver in water, and in accordance with accompanying specifications deposits silver at the rate of 0-001118 of a gram per second.
Page 584 - As a unit of resistance, the international ohm, which is based upon the ohm equal to 10" units of resistance of the CGS system of electromagnetic units, and is represented by the resistance offered to an unvarying electric current by a column of mercury at the temperature of melting ice, 14.4521 grams in mass, of a constant cross-sectional area and of the length of 106.3 centimetres.
Page 585 - The liquid should consist of a neutral solution of pure silver nitrate, containing about 15 parts by weight of the nitrate to 85 parts of water. The resistance of the voltameter changes somewhat as the current passes. To prevent these changes having too great an effect on the current, some resistance besides that of the voltameter should be inserted in the circuit.
Page 585 - ... the electro-motive force that, steadily applied to a conductor whose resistance is one international ohm, will produce a current of one international ampere, and which is represented sufficiently well for practical use by { £ %$ of the electro-motive force between the poles or electrodes of the voltaic cell known as Clark's cell, at a temperature of 15°...
Page 586 - 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. As a unit of power, the watt, which is equal to 10...
Page 318 - I say, if these things are so, may not the knowledge of this power of points be of use to mankind, in preserving houses, churches, ships, &c. from the stroke of lightning, by directing us to fix on the highest parts of those edifices, upright rods of iron made sharp as a needle, and gilt to prevent rusting, and from the foot of those rods a wire down the outside of the building into the ground, or down round one of the shrouds of a ship...
Page 588 - Then insert the cork and zinc rod, passing the glass tube through the hole prepared for it. Push the cork gently down until its lower surface is nearly in contact with the liquid. The air will thus be nearly...
Page 589 - ... tube through the hole prepared for it. Push the cork gently down until its lower surface is nearly in contact with the liquid. The air will thus be nearly all expelled, and the cell should be left in this condition for at least twenty-four hours before sealing, which should be done as follows.
Page 585 - As a unit of electromotive force, the international volt, which is the electromotive force that, steadily applied to a conductor whose resistance is one international ohm, will produce a current of one international ampere, and which is represented sufficiently well for practical use by ^2.
Page 318 - Would not these pointed rods probably draw the electrical fire silently out of a cloud before it came nigh enough to strike, and thereby secure us from that most sudden and terrible mischief?