Magnetism and Electricity |
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action angle apparatus attached attracted bar magnet becomes binding-screws brass Bring called cell centimetres coil connected consists copper wire current passes deflection density dilute sulphuric acid direction disc discharge distance earth electrical machine electrified electrified body electrode electrolysis electromotive force fastened force friction frictional electricity galvanometer glass rod gold-leaf electroscope gutta-percha horizontal hydrogen inches induction iron filings knob last experiment leaves diverge Leyden jar liquid lodestone magnetic meridian magnetic needle magnetic pole magnetised means metal N-seeking pole negative charge neutralise north magnetic pole Notice Observe opposite outer coating piece pith ball platinum positive charge positive electricity potassium iodide potential prime conductor produced proof-plane quantity of electricity repelled repulsion resistance round sealing-wax sheet shellac shown in fig silk thread similar soft iron spark sphere steel strength strip sulphate sulphuric acid surface suspended takes place tinfoil touch tube vertical vessel voltaic vulcanite wire
Popular passages
Page 94 - A slight cubical wooden frame was constructed, and copper wire passed along and across it in various directions, so as to make the sides a large net-work, and then all was covered in with paper, placed in close...
Page 94 - I went into the cube and lived in it, and using lighted candles, electrometers, and all other tests of electrical states, I could not find the least influence upon them, or indication of...
Page 24 - ... determined limit, loosely called the duration, and to which, the arc of oscillation being known, the really observed duration may easily be reduced. The intensity of terrestrial magnetism is thus inversely proportional to the square of the duration of oscillation of the same needle, or directly so to the square of the number of oscillations in a given time ; and the result relates to the whole force, or to the horizontal portion of it, according as the needle has been caused to vibrate, in the...
Page 228 - Two wires coming from the two ends of a Grove's battery are dipped into the liquid on opposite sides of this partition. On one side the colour is observed to disappear. Explain its disappearance, and mention the end of the battery (whether the zinc end or the platinum end) from which the wire that destroys the colour proceeds.
Page 10 - You are required to demonstrate the law that ' like magnetic poles repel,' and that ' unlike poles attract each other
Page 195 - A wire connecting the platinum and zinc ends of a battery is stretched vertically half way between the needles. How will the current in the wire affect the needles, and how will the result depend upon whether the platinum terminal is connected with the upper or lower end of the wire respectively ? 14.
Page 83 - A stout stick of sealing-wax is stuck upright to a piece of wood acting as a base; into the wax at the top is inserted a needle, and on to the needle is fixed an apple. Near to the apple, but not into contact with it, is brought a rod of glass which has been rubbed by silk. What is the condition of the apple while the rod remains near it? What occurs when the apple is touched for a moment? What finally occurs when the rubbed glass is withdrawn?
Page 100 - A pewter pot is insulated and electrified. If you touch it at different parts with a penny stuck to the end of a rod of sealing-wax, what part of the pot will give the greatest quantity of electricity to the penny ? 6.
Page 172 - If you have within reach two wires connected one to one end and the other to the other end of a voltaic battery which is hidden, say how you could tell which wire is connected to the zinc end of the battery.
Page 166 - Two copper wires connected, one with the zinc end and the other with the platinum end of a voltaic battery, but not connected with each other, are brought near a piece of sealing-wax that has been rubbed with flannel, and then nicely balanced on a point. Would the wires differ in any way in their action upon the sealing-wax ? If so, how and why ? 6.