Electricity Made Easy: By Simple Language and Copious Illustration (Google eBook)

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American Technical Book Company, 1898 - Electric engineering - 342 pages
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Page 219 - Have ready in another vessel a hot solution of prussiate of potash, to which a small quantity of sulphuric acid has been added. Dip the silk in this liquid ; on removal rinse in clean water, and expose to the air to dry.
Page 215 - When a plate of zinc and a plate of copper are placed in a vessel of water, and the two metals are made to touch each other, either directly or by the intervention of a metallic wire, galvanism is excited.
Page 60 - In general, there are two ways in which this can be done ; viz., by the use of electric conduits, and by the use of electric tubes.
Page 222 - ... Varley, the porous diaphragm is dispensed with by placing the lighter liquid (a diluted solution of zinc sulphate) above the heavier liquid (a saturated solution of copper sulphate); the separation being maintained by their difference of specific gravity.
Page 280 - ... on arrival at a conductor, at a corresponding negative charge. This, while being a purely arbitrary assumption, is, nevertheless, advantageous in fixing ideas. Similarly, magnetic flux is assumed to issue from a magnet at its north-seeking pole and to reenter it at its south-seeking pole. This assumption is also purelyarbitrary.
Page 177 - An electromagnet can attract or repel other magnets. lt can also attract iron. However, there are still some important differences between the two. First, electromagnets can be turned on or off by turning the current on or off. Second, the polarity of the electromagnet (which end is north and which is south) can be reversed by reversing the current flow. Finally, the strength of the magnet can be varied by varying the current flowing through the coil or by increasing the number of loops in the coil.
Page 89 - ... will carry depends upon the size of the conductor and the material of which it is made. That property of a conductor which opposes the flow of current in the conductor is called the resistance of the conductor. The unit of electrical resistance is the ohm and its value is so chosen that a current of one ampere will flow through a circuit whose resistance is one ohm when a potential of one volt is applied to the terminals of the circuit. Resistance, therefore, tends to limit the flow of current...
Page 296 - This pull depends on the amount of magnetic flux which passes through the armature, on the strength of the current supplied to the motor, and on the number of coils of wire placed on the armature.
Page 280 - The direction of the flux streams which surround a magnet can be shown "by sprinkling iron filings on a glass plate placed over the magnet...
Page 251 - W, is connected with the other terminal of the cell and one terminal of the bell. The other terminal of the bell is then connected with the other terminal of the push button by the wire W".

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