Elementary Lessons in Electricity & MagnetismMacmillan and Company, 1886 - 456 sider |
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Side 11
... Needle Electroscope . - The earliest electroscope was that devised by Dr. Gilbert , and shown in Fig . 6 , which consists of a stiff straw balanced lightly Fig . 6 . upon a sharp point . A thin strip of brass or wood , or even a goose ...
... Needle Electroscope . - The earliest electroscope was that devised by Dr. Gilbert , and shown in Fig . 6 , which consists of a stiff straw balanced lightly Fig . 6 . upon a sharp point . A thin strip of brass or wood , or even a goose ...
Side 46
... needle 1 Invented in 1752 by Franklin , for the purpose of warning him of the presence of atmospheric electricity , drawn from the air above his house by a pointed iron rod . to the conductor , it discharges the electricity so effect ...
... needle 1 Invented in 1752 by Franklin , for the purpose of warning him of the presence of atmospheric electricity , drawn from the air above his house by a pointed iron rod . to the conductor , it discharges the electricity so effect ...
Side 68
... needle of metal is suspended so as to turn about a point C. It is elec- trified from a known source . Under it are ... needle until the two are brought into contact , or connected by a third piece of metal , when the needle immediately ...
... needle of metal is suspended so as to turn about a point C. It is elec- trified from a known source . Under it are ... needle until the two are brought into contact , or connected by a third piece of metal , when the needle immediately ...
Side 73
... Needle . To investigate more fully the magnetic forces a magnetic needle is employed . This consists ( Fig . 42 ) of a light needle cut out of steel , and fitted with a little cap of brass , glass , or agate , by means of which it can ...
... Needle . To investigate more fully the magnetic forces a magnetic needle is employed . This consists ( Fig . 42 ) of a light needle cut out of steel , and fitted with a little cap of brass , glass , or agate , by means of which it can ...
Side 74
... needle , we shall find that it is repelled by one pole and attracted by the other ; and that the same pole which attracts the north - pointing end of the needle re- pels the south- pointing end . If we try a simi- lar experiment on ...
... needle , we shall find that it is repelled by one pole and attracted by the other ; and that the same pole which attracts the north - pointing end of the needle re- pels the south- pointing end . If we try a simi- lar experiment on ...
Andre utgaver - Vis alle
Elementary Lessons in Electricity & Magnetism Silvanus Phillips Thompson Uten tilgangsbegrensning - 1894 |
Elementary Lessons in Electricity & Magnetism Silvanus Phillips Thompson Uten tilgangsbegrensning - 1902 |
Elementary Lessons in Electricity and Magnetism Silvanus Phillips Thompson Uten tilgangsbegrensning - 1921 |
Vanlige uttrykk og setninger
acid action æther ampères angle armature attracted ball battery brass carbon centimetre charge of electricity chemical circuit coil condenser conductor copper current flows Daniell's cells deflection diamagnetic dielectric difference of potential direction disc discharge distance earth earth's magnetism electric force electrical machine electrified body electromagnet electrometer electromotive-force electroscope electrostatic equal Faraday friction galvanometer glass rod gramme heat Hence hydrogen instrument insulated internal resistance inversely iron knob length Lesson Leyden jar light lines of force lines-of-force liquid magnetic force magnetic pole magnetic potential magnetic shell magnetised measured metal negative observed Ohm's law ohms opposite kind oscillations particles pass piece placed plate platinum polarisation positive produced proportional quantity of electricity repelled repulsion rotation round rubbed shown in Fig spark sphere steel strength substances sulphuric surface tangent tangent galvanometer thin torsion torsion balance touched tube turns voltaic volts wire zinc
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