A Century of ElectricityMacmillan, 1887 - 229 páginas |
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Página 130
... vibrating with the same fre- quency . It is influenced by an electro - magnet placed near it , through which the intermittent or vibratory current passes . Now , if the number of vibrations per second of the first or transmitting reed ...
... vibrating with the same fre- quency . It is influenced by an electro - magnet placed near it , through which the intermittent or vibratory current passes . Now , if the number of vibrations per second of the first or transmitting reed ...
Página 131
... vibration frequency of one set is 300 per second , while that of the other is 500. When both reeds are connected to the line , a series of impulses will be trans- mitted , compounded of these two frequencies , resulting in a sort of ...
... vibration frequency of one set is 300 per second , while that of the other is 500. When both reeds are connected to the line , a series of impulses will be trans- mitted , compounded of these two frequencies , resulting in a sort of ...
Página 132
... vibrations per second will respond to it , and the same is true of that whose vibration frequency is 500 per second ; but neither will respond when the vi- brations corresponding to the other are alone transmitted . By manipulating the ...
... vibrations per second will respond to it , and the same is true of that whose vibration frequency is 500 per second ; but neither will respond when the vi- brations corresponding to the other are alone transmitted . By manipulating the ...
Página 136
... vibrating reeds , or tuning - forks , care- fully adjusted to agree with each other in pitch . Accordingly the revolving arms are driven by electric motors , the operation of which is con- trolled by vibrating forks . the electro ...
... vibrating reeds , or tuning - forks , care- fully adjusted to agree with each other in pitch . Accordingly the revolving arms are driven by electric motors , the operation of which is con- trolled by vibrating forks . the electro ...
Página 208
... vibrations of parts of the receiver ; and these must vary in rapidity and form , along with the variations in rapidity and form of the electric waves gener- ated by the action of the transmitting instru- ment . There is doubtless a ...
... vibrations of parts of the receiver ; and these must vary in rapidity and form , along with the variations in rapidity and form of the electric waves gener- ated by the action of the transmitting instru- ment . There is doubtless a ...
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already Ampère appear armature arranged attracted battery beatification cable carbon cell century chemical circuit coil conductor connected consists construction copper core Crown 8vo current of electricity CYRUS W dash Davy deflect device devised direction discovery disk duced duplex dynamo dynamo-electric dynamo-electric machine effect elec electric current electric light electric telegraph electricians electrified electro-magnet electromotive force energy exhibited experiment experimental extremely fact Faraday Faraday's field flow Franklin Galvani galvanometer gutta-percha heat important increased induction insulated invention inventors known lamp latter Leyden jar lines of force machine magnetic needle means ment metals method Morse motion motor nearly number of lines Oersted's operation passed periment poles possible present principle produced rapid receiving instrument resistance rotation Royal Society science of electricity scientific signals siphon recorder stopcock successful sulphuric acid telegraph tion trans transmission transmitted tricity vibration wheel wire zinc
Pasajes populares
Página 46 - ... of an inch), a bright spark was produced, and more than half the volume of the charcoal became ignited to whiteness, and by withdrawing the points from each other a constant discharge took place through the heated air, in a space equal at least to four inches, producing a most brilliant ascending arch of light, broad and conical in form in the middle.
Página 22 - I never was before engaged in any study that so totally engrossed my attention and my time, as this has lately done ; for what with making experiments when I can be alone, and repeating them to my friends and acquaintance, who, from the novelty of the thing, come continually in crowds to see them, I have, during some months past, had little leisure for any thing else.
Página 47 - ... producing a most beautiful coruscation of purple light, the charcoal became intensely ignited, and some platina wire attached to it, fused with brilliant scintillations, and fell in large globules upon the plate of the pump. All the phenomena of chemical decomposition were produced with intense rapidity by this combination.
Página 25 - 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 in which we can already compare them, is it not probable they agree likewise in this? Let the experiment be made.