Electricity and Its UsesReligious tract society, 1883 - 180 pagini |
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Pagina 2
... rubbed it acquired the power of attracting very light bodies , such as grains of dust or bits of straw . Thales lived six hundred years before Christ , and for more than two thousand years little else was known about the mysterious ...
... rubbed it acquired the power of attracting very light bodies , such as grains of dust or bits of straw . Thales lived six hundred years before Christ , and for more than two thousand years little else was known about the mysterious ...
Pagina 3
... rubbed with the silk and put in the place of the glass rod , the electrified ball will be attracted to the wax . The ... rubbed with cat's skin , for example , it will become charged with negative instead of positive electricity , and ...
... rubbed with the silk and put in the place of the glass rod , the electrified ball will be attracted to the wax . The ... rubbed with cat's skin , for example , it will become charged with negative instead of positive electricity , and ...
Pagina 4
... rubbed by the hands , and Otto Von Guericke , the illustrious burgomaster of Magdeburg , used a ball of sulphur . Soon , however , the practice came in of employing cylinders or discs of glass rubbed by silk cushions ; and the ...
... rubbed by the hands , and Otto Von Guericke , the illustrious burgomaster of Magdeburg , used a ball of sulphur . Soon , however , the practice came in of employing cylinders or discs of glass rubbed by silk cushions ; and the ...
Pagina 12
... rubbed together , and it does not do to allow an inferior substance like hydrogen to take the place of the copper . All cells in which this effect of polarisation , " or the polarising of the negative plate , is not well prevented are ...
... rubbed together , and it does not do to allow an inferior substance like hydrogen to take the place of the copper . All cells in which this effect of polarisation , " or the polarising of the negative plate , is not well prevented are ...
Pagina 173
... rubbed with wool , just as chaff or shreds of cotton are attracted by a rod of sealing - wax that has been rubbed upon the sleeve . ELECTRIC ALARMS . Turning now to the minor uses of electricity , and first to those in the household ...
... rubbed with wool , just as chaff or shreds of cotton are attracted by a rod of sealing - wax that has been rubbed upon the sleeve . ELECTRIC ALARMS . Turning now to the minor uses of electricity , and first to those in the household ...
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Termeni și expresii frecvente
accumulators action apparatus armature attracted axle bell bobbin brass brushes C. F. Varley cable candle carbon cathode charge clapper coil of wire conductor connected consists copper copper plate current flows current of electricity current passes cylinder decomposed deposited disc dynamo dynamo-electric machine earth Edison elec electric current electric lamps electric light electrified electro-magnet electro-plating employed excited fluid friction frictional electricity galvanometer glass Gramme machine heat hence hydrogen illustrated in Fig incandescent lamps Induction Balance induction coil insulated kind of electricity lever magnet metal microphone transmitter mirror galvanometer Morse motor negative pair paper pencil placed platinum wire polarise poles primary circuit Professor resistance ring rotated rubbed secondary sending shown in Fig Siemens signals silk silver SIPHON RECORDER soft iron solution sound spark station sulphuric acid surface telegraph line telephone traverses tricity vibrating voltaic battery voltaic pile wire zinc zinc plate
Pasaje populare
Pagina 103 - Son of his love ; in whom we have our redemption, the forgiveness of our sins: who is the image of the invisible God, the firstborn of all creation; for in him were all things created, in the heavens and upon the earth, things visible and things invisible, whether thrones or dominions or principalities or powers; all things have been created through him, and unto him; and he is before all things, and in him all things consist.
Pagina 60 - ... of the age, although it is not very well known, because only a few are required, and these are only to be seen abroad, if FIG. 23. we except those now being exhibited at the Crystal Palace, Sydenham. A general view of the instrument is given in Fig. 23, and the leading parts are detailed in Fig. 24. The principle of its action is just the reverse of the mirror galvanometer. In that instrument a tiny magnet moved within a fixed coil of wire ; in the siphon recorder a light coil of wire moves between...
Pagina 20 - Seebeck, that when two different metals are soldered together so as to form a closed ring or circuit, as at A in Fig 6, and one of the junctions is heated more than the other, an electric current is set up in the circuit. With one pair of junctions a very feeble current is produced, just as a single voltaic element gives a feeble current, but by combining a number of pairs in the fashion of B, Fig.
Pagina 10 - All things constructed as above, and the minute previously fixed, I begin the conversation with my distant friend in this manner. Having set the electrical machine a-going as in ordinary experiments, suppose I am to pronounce the word Sir; with a piece of glass or any other electric per se, I strike the wire S...
Pagina 32 - The magnetisation of a bar of steel or iron, according to this theory, consists in establishing within the metal by induction a series of electrical currents, all revolving in the same direction at right angles to the axis or length of the bar.
Pagina 5 - Hence we have the law that like kinds of electricity repel each other, and unlike kinds attract.
Pagina 13 - ... the supply of heat. No matter how long the connecting wire is, the current will flow through it, provided it is entire, and hence it is that we have telegraph lines two or three thousand miles long. The water in this combination supplies the oxygen to burn the zinc, and sulphuric acid is merely added to reduce the resistance of the water to the passage of the electricity through it, for the current starts from the zinc plate where the chemical action takes place, and flows to the copper plate...
Pagina 59 - The details of this needle are shown in the lower figure, where cc are sectionsthrough the coil, M is the magnet-needle, carrying in front of it a small mirror. This needle is enclosed in a small chamber, glazed by a lens G, and inserted in the hollow of the coil c. A curving magnet H is supported over the coil to adjust the position of the smaller magnet in the chamber.
Pagina 61 - ... coil of wire ; in the siphon recorder a light coil of wire moves between the poles of a powerful magnet. The signal currents pass through the suspended coil to earth, and in doing so the coil turns to left or right, according as the currents are positive or negative. These movements of the coil are communicated by a connecting thread to a fine glass siphon, which is constantly spurting ink upon a band of travelling paper, and hence the trace of the ink on the paper follows and delineates the...
Pagina 68 - Bell of improving the operation of his harmonic telegraph by causing the transmitting interrupters each to make and break the primary circuit of an induction coil, the secondary circuit of which could be placed in the main line by the depression of a key.