Electricity, Its History and DevelopmentA.C. McClurg, 1912 - 176 páginas |
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Términos y frases comunes
alternating current amount amperes apparatus applied arc lamp armature arranged attraction battery body called carbon circuit conductor connected copper current flowing decreases device direct current direction disc discharge discovery earth Edison effect elec electric charge electric current electrical machine electrical pressure electrified electro-magnet electro-motive force electrodes experiments Faraday Faraday's filament Fleming's Franklin glass globe heat increased induced insulated iron filings Joule's law length Leyden jar light lines of force loop magnetic field magnetic force magnetic pole mechanical melting ments mercury metal motion motor needle nitrogen north pole number of lines Ohm's law opposite parallel passing pioneers plates platinum produced railway rectangle relation rent resistance result right-hand rule ring rotation secondary shown in Figure solenoid soon south pole speed substance telegraph telephone temperature theory tion transmission transmitted tricity tube turn unit vibrations voltaic cell volts winding wire zinc
Pasajes populares
Página 35 - And when the rain has wet the kite and twine so that it can conduct the electric fire freely, you will find it stream out plentifully from the key on the approach of your knuckle. At this key the phial may be charged ; and, from electric fire thus obtained, spirits may be kindled and all the other electric experiments be performed which are usually done by the help of a rubbed glass globe or tube, and thereby the sameness of the electric matter with that of lightening completely demonstrated.
Página 35 - This kite is to be raised when a thunder-gust appears to be coming on, and the person who holds the string must stand within a door or window, or under some cover, so that the silk ribbon may not be wet; and care must be taken that the twine does not touch the frame of the door or window. As soon as...
Página 34 - Make a small cross of two light strips of cedar, the arms so long as to reach to the four corners of a large thin silk handkerchief when extended...
Página 33 - Electrical fluid agrees with lightning in these particulars. 1. Giving light. 2. Color of the light. 3. Crooked direction. 4. Swift motion. 5. Being conducted by metals. 6. Crack or noise in exploding. 7. Subsisting in water or ice. 8. Rending bodies it passes through. 9. Destroying animals. 10. Melting metals. 11. Firing inflammable substances. 12.
Página 33 - ... feet, pointed very sharp at the end. If the electrical stand be kept clean and dry, a man standing on it, when such clouds are passing low, might be electrified and afford sparks, the rod drawing fire to him from a cloud.
Página 61 - By trial with a trough each was insulated from the other. Will call this side of the ring A. On the other side but separated by an interval was wound wire in two pieces together amounting to about 60 feet in length, the direction being as with the former coils; this side call B.
Página 33 - Rending bodies it passes through. 9. Destroying animals. 10. Melting metals. 11. Firing inflammable substances. 12. Sulphureous smell. The electric fluid is attracted by points. We do not know whether this property is in lightning. But since they agree in all the particulars wherein we can already compare them, is it not probable they agree likewise in this ? Let the experiment be made.
Página 33 - On the top of some high tower or steeple, place a kind of sentry-box, big enough to contain a man and an electrical stand. From the middle of the stand let an iron rod rise and pass bending out of the door, and then upright twenty or thirty feet, pointed very sharp at the end.
Página 87 - Suppose that a man speaks near a movable disc, sufficiently flexible to lose none of the vibrations of the voice; that this disc alternately makes and breaks the connection with a battery; you may have at a distance another disc which will simultaneously execute the same vibrations.
Página 84 - Suppose,' said Professor Morse, ' that in experimenting on twenty miles of wire, we should find that the power of magnetism is so feeble that it will...