Elementary Lessons in Electricity & Magnetism |
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Page 3
... piece of seal- ing - wax , or of resin , or a glass rod , and rub it upon a piece of flannel or silk , it will be found to have acquired a property which it did not previously possess : namely , the power of attracting to itself such ...
... piece of seal- ing - wax , or of resin , or a glass rod , and rub it upon a piece of flannel or silk , it will be found to have acquired a property which it did not previously possess : namely , the power of attracting to itself such ...
Page 5
... piece of silk ribbon , if rubbed with warm indiarubber , or even if drawu between two pieces of warm flannel , and then hung up by one end , will be found to be attracted by objects presented to it . If held near the wall of the room it ...
... piece of silk ribbon , if rubbed with warm indiarubber , or even if drawu between two pieces of warm flannel , and then hung up by one end , will be found to be attracted by objects presented to it . If held near the wall of the room it ...
Page 6
... piece of feather or down be hung by a silk toward the hand , as the rubbed body ( in Fig . 3 ) did . This proves that the feather , though it has not itself been other . This may be confirmed by a further experiment . A rubbed glass rod ...
... piece of feather or down be hung by a silk toward the hand , as the rubbed body ( in Fig . 3 ) did . This proves that the feather , though it has not itself been other . This may be confirmed by a further experiment . A rubbed glass rod ...
Page 7
... piece of sealing - wax , or resin , or amber , though repelled by a rubbed piece of glass . The two pith - balls touched ( as in Fig . 5 ) with a rubbed glass rod fly from one another by repulsion , and , as we have seen , fly wider ...
... piece of sealing - wax , or resin , or amber , though repelled by a rubbed piece of glass . The two pith - balls touched ( as in Fig . 5 ) with a rubbed glass rod fly from one another by repulsion , and , as we have seen , fly wider ...
Page 13
... piece of rough glass be rubbed on a piece of smooth glass , electrification is observed ; and indeed the conditions of the surface play a very important part in the production of electrification by friction . In general , of two bodies ...
... piece of rough glass be rubbed on a piece of smooth glass , electrification is observed ; and indeed the conditions of the surface play a very important part in the production of electrification by friction . In general , of two bodies ...
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Common terms and phrases
acid action amperes angle attracted ball battery capacity carbon cell centimetre charge of electricity chemical circuit coil condenser conductor copper current flows deflexion diamagnetic dielectric difference of potential direction discharge disk distance dynes earth earth's magnetism elec electric force electrified body electromagnet electrometer electromotive-force electroscope electrostatic equal Faraday field-plates friction galvanometer glass rod grammes heat Hence hydrogen induction influence machines insulated inversely iron kathode knob length Lesson Leyden jar lines of force liquid magnetic field magnetic force magnetic lines magnetic pole magnetic potential measured metal move negative charge ohms opposite kinds particles pass piece placed plate polar positive charge produced proportional quantity of electricity repelled repulsion resistance rotating round rubbed shown in Fig spark sphere square square centimetre steel strength substances surface tangent thin tion torsion torsion balance touched tricity tube turns unit volts wire zinc
Popular passages
Page 586 - As a umt of resistance, the international ohm, which is based upon the ohm equal to 109 units of resistance of the Centimetre-Gramme-Sevond 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 grammes in mass, of a constant cross-sectional area and of the length of 100-3 centimetres.
Page 588 - 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 591 - ... above the cork, using sufficient to cover completely the zinc and soldering. 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 587 - 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 590 - ... temperature, agitating it from time to time, then allow it to cool ; continue to shake it occasionally while it is cooling. Crystals of zinc sulphate should then be distinctly visible, and should be distributed throughout the mass ; if this is not the case, add more crystals from the stock bottle, and repeat the whole process. This method ensures the formation of a saturated solution of zinc and mercurous sulphates in water. To set up the Cell. The cell may conveniently be set up in a small test...
Page 587 - 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...
Page 587 - 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 590 - C. Keep the paste for an hour at this temperature, agitating it from time to time, then allow it to cool ; continue to shake it occasionally while it is cooling. Crystals of zinc sulphate should then be distinctly visible, and should be distributed...
Page 589 - The Zinc. — Take a portion of a rod of pure redistilled zinc, solder to one end a piece of copper wire, clean the whole with glass paper, carefully removing- any loose pieces of the zinc.