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CHAPTER XII.

MISCELLANEOUS.

Decomposition of water by electric current-Voltameter-Bain's
electro-chemical telegraph-Electro-plating-Edison's current-

meter-Electrotyping-Elkington's

process-Nickel-plating-

Electrolysis-Electric alarms-Thermostat-Butterfly clock
-Electric photography-Weather telegraphs-Experimental
apparatus-Electricity as a curative agent.

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LIST OF ILLUSTRATIONS.

FIG.

1.-APPARATUS FOR SHOWING FRICTIONAL ELECTRICITY 2.-ORDINARY PLATE-GLASS MACHINE

3.-WIMSHURST INFLUENCE MACHINE

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15. MAGNETIC FIELD SHOWING INDUCTION

"GREAT EASTERN" LAYING TELEGRAPHIC CABLE.

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16.-TELEGRAPH CIRCUIT

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17.-VARLEY'S INSULATOR

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18.-MORSE INK-WRITER

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19.-MORSE INSTRUMENT

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FIG.

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35.-CARBON MICROPHONE

36.-BLAKE TRANSMITTER IN SECTION

37.-WIRE-GAUZE TRANSMITTER.

38.-TELEPHONE CIRCUIT WITH MICROPHONE TRANSMITTER

39.-BELL APPARATUS

40.-GOWER-BELL TELEPHONE

41.-DOLBEAR TELEPHONE

42.-MICROPHONE AND TELEPHONE CIRCUIT

43.-BELL PHOTOPHONE

44.-MERCADIER'S CELL

45. THE TELERADIOPHONE

46.-BIDWELL'S TELEPHOTOGRAPH

47.-DIAGRAM SHOWING PRINCIPLE OF TELEPHOTOGRAPH

48.-DIAMOND PATTERN TRANSMITTED BY TELEPHOTOGRAPH

49. THE SONOMETER

50.-INDUCTION BALANCE

51.-INDUCTION BALANCE COILS.

52. SKELETON DIAGRAM OF GENERATOR

53.-GRAMME DYNAMO-ELECTRIC GENERATOR 54.-SIEMENS' GENERATOR.

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55.-BRUSH GENERATOR

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63.-JABLOCHKOFF CANDLE

64.-ARRANGEMENTS FOR JABLOCHKOFF LIGHTING

65.-ELECTROPYRE OF LAMP SOLEIL

67.-REGNIER AND WERDERMANN LIGHT-GIVER 68.-JOEL LAMP

69.-EXTERNAL APPEARANCE OF JOEL LAMP

70.-EDISON INCANDESCENT LAMP

72.-ARRANGEMENT OF ELECTRIC LAMPS

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77.-GRISCOM MOTOR APPLIED TO A SEWING MACHINE

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ELECTRICITY AND ITS USES.

CHAPTER I.

INTRODUCTORY.

THE advances made in the application of electricity during the past ten years have been truly marvellous. No doubt the electric era was ushered in some forty years ago by the introduction of the telegraph, but it is only within the last decade that the telephone, the electric light, and the transmission of motive power by electricity have become matters of every day use. Moreover, we have arrived now at a point from which we can foresee a still more remarkable progress in the future. The recent electrical exhibitions at Paris and at the Crystal Palace have not only shown how much has already been done in fitting electricity for the service of mankind, but also how much remains to do. The present, therefore, is, we think, a good time for giving a popular account of electrical appliances such as they are and may yet be, especially as public interest in the subject was never higher than it is just now. In the following pages it shall be our endeavour to describe all the most important developments of electricity in plain language, as free from technical

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