Elementary Lessons in Electricity & Magnetism |
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Common terms and phrases
acid action alternate currents amperes angle anode armature attracted ball battery capacity carbon centimetres chemical circuit coil condenser conductor copper current flows deflexion diamagnetic dielectric difference of potential direction discharge disk distance dynamo dynes earth earth's magnetism 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 iron core kathode knob length Lesson Leyden jar light lines of force liquid machine magnetic field magnetic force magnetic lines magnetic pole magnetic potential measured metal method motor move N-seeking needle negative Ohm's law ohms opposite oscillations pass placed plate platinum polarization positive produced proportional quantity of electricity repelled rotation round rubbed shown in Fig spark sphere steel strength substances sulphate surface tangent thin tion tube turns unit of electricity volts wire zinc
Popular passages
Page 320 - 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...
Page 583 - 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 586 - ... tube, taking care that the whole of the exposed platinum is covered. Shake up the paste and introduce it without contact with the upper part of the walls of the test tube, filling the tube above the mercury to a depth of rather more than 1cm.
Page 587 - The glass tube containing the platinum wire should project some way above the top of the marine glue. The cell may be sealed in a more permanent manner by coating the marine glue, when it is set, with a solution of sodium silicate, and leaving it to harden.
Page 320 - 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 583 - Ampere, which is one-tenth 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, in accordance with a certain specification, deposits silver at the rate of 0.001118 of a gramme per second.
Page 583 - The unit of quantity shall be what is known as the international coulomb, which is the quantity of electricity transferred by a current of one international ampere in one second. Fifth. The unit of capacity shall be what is known as the international farad, which is the capacity of a condenser charged to a potential of one international volt by one international coulomb of electricity.
Page 587 - 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 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 583 - The unit of current shall be what is known as the international ampere, which is onetenth of the unit of current of the centimeter-gramsecond system of electro-magnetic units, and is the practical equivalent of the unvarying current, which, when passed through a solution of nitrate of silver in water...