Tog Y3 W27 Ug Technological Progress & The Unification Of Germany

Front 1

transmitter

Back 1

the part of a telephonic or telegraphic apparatus that converts sound waves or mechanical movements into corresponding electric waves or impulses

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simultaneous

Back 2

existing, occurring, or operating at the same time; concurrent

Front 3

telegraphy

Back 3

an apparatus, system, or process for transmitting messages or signals to a distant place, esp. by means of an electric device consisting essentially of a sending instrument and a distant receiving instrument connected by a conducting wire or other communications channel

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phonautograph

Back 4

An instrument by means of which a sound can be made to produce a visible trace or record of itself. It consists essentially of a resonant vessel, closed at one end by a flexible membrane. A stylus attached to some point of the membrane records the movements of the latter, as it vibrates, upon a moving cylinder or plate.

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undulatory

Back 5

having the form or appearance of waves.

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phonograph

Back 6

any sound-reproducing machine using records in the form of cylinders or discs.

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incandescent

Back 7

1.glowing or white with heat.
2.intensely bright; brilliant.

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filament

Back 8

a very fine thread or threadlike structure; a fiber or fibril

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direct current

Back 9

an electric current of constant direction, having a magnitude that does not vary or varies only slightly. Abbreviation: dc

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alternating current

Back 10

an electric current that reverses direction at regular intervals, having a magnitude that varies continuously in sinusoidal manner. Abbreviation: ac