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| 1. |
Some researches on the safe use of electricity in coal mines |
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Journal of the Institution of Electrical Engineers,
Volume 62,
Issue 330,
1924,
Page 481-491
W.M.Thornton,
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PDF (1607KB)
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摘要:
The limiting electrical conditions under which ignition of coal dust and firedamp may occur have been worked at in the author's laboratory for the past 14 years, as part of a general investigation of the mechanism of ignition of gases. The paper contains an account of some results of practical interest, and deals with the electrical ignition of coal dust alone, coal dust with gas present, of methane and associated gases by disruptive sparks, steady or impulsive, transient arcs, direct or alternating, with varied voltage and frequency, in all percentages of mixture with air. Examples are given of the application of the results to promote safety in mines, notably the influence of currents of higher frequency than usual, of safety bells, safety lamps which give an alarm signal when dangerous mixtures of gas occur, and an improved earthing plate.
DOI:10.1049/jiee-1.1924.0068
出版商:IEE
年代:1924
数据来源: IET
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| 2. |
The determination of resonant frequencies and decay factors |
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Journal of the Institution of Electrical Engineers,
Volume 62,
Issue 330,
1924,
Page 517-525
E.Mallett,
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PDF (820KB)
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摘要:
Simple resonance curves plotted vectorically are approximately circular in form. The paper shows how the circle can be derived from the ordinary resonance curve by a simple graphical construction, and how from the derived circle and the original resonance curve a straight line can be drawn from which the resonance frequency and the damping are at once determined.The constructions developed are explained by their application to telephone-receiver impedances and to electrical circuits.
DOI:10.1049/jiee-1.1924.0078
出版商:IEE
年代:1924
数据来源: IET
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| 3. |
Development of the Bellini-Tosi system of direction finding in the British mercantile marine |
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Journal of the Institution of Electrical Engineers,
Volume 62,
Issue 330,
1924,
Page 543-550
J.A.Slee,
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PDF (1132KB)
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摘要:
The paper gives an account of the various sources of error which have been encountered during the development of the Bellini-Tosi system of wireless direction-finding as an aid to navigation in the British mercantile marine. These errors can be isolated and their causes removed one by one.The application of the instrument to the purposes of navigation is also dealt with, and the possible errors, external to the ship, which may be encountered- are considered.A table is attached showing the high degree of accuracy which has now been attained.
DOI:10.1049/jiee-1.1924.0080
出版商:IEE
年代:1924
数据来源: IET
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