A Century of ElectricityMacmillan, 1887 - 229 páginas |
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Página 22
... receiving it , Franklin began a series of experiments , resulting in discoveries " the extent and brilliancy of which , " according to a celebrated English authority , " gave a form and dignity to the science of electricity which it had ...
... receiving it , Franklin began a series of experiments , resulting in discoveries " the extent and brilliancy of which , " according to a celebrated English authority , " gave a form and dignity to the science of electricity which it had ...
Página 72
... in arithmetic , his own knowledge of the subject being con- fined to addition and subtraction . He was soon beyond the possibility of receiving aid from his master , but the kindness of others in lending him 72 A CENTURY OF ELECTRICITY .
... in arithmetic , his own knowledge of the subject being con- fined to addition and subtraction . He was soon beyond the possibility of receiving aid from his master , but the kindness of others in lending him 72 A CENTURY OF ELECTRICITY .
Página 91
... receiving operator . It consisted of a device by means of which the movement of one of the needles re- leased a small ball of lead , which , by dropping upon the mechanism of the alarm , set it in THE ELECTRO - MAGNETIC TELEGRAPH . 91.
... receiving operator . It consisted of a device by means of which the movement of one of the needles re- leased a small ball of lead , which , by dropping upon the mechanism of the alarm , set it in THE ELECTRO - MAGNETIC TELEGRAPH . 91.
Página 92
... receiving instruments , and the arrangement included a device for set- ting off an alarm - clock . The current from a battery was first used , but afterwards the sec- ondary or induced current was substituted . This line was in working ...
... receiving instruments , and the arrangement included a device for set- ting off an alarm - clock . The current from a battery was first used , but afterwards the sec- ondary or induced current was substituted . This line was in working ...
Página 94
... receiving instrument , from which it will be un- derstood that what is here stated concerning velocities refers to the time required for the production of certain effects through certain conductors , and that 94 A CENTURY OF ELECTRICITY .
... receiving instrument , from which it will be un- derstood that what is here stated concerning velocities refers to the time required for the production of certain effects through certain conductors , and that 94 A CENTURY OF ELECTRICITY .
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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
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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.