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| 11. |
Hampshire Sub-Centre: Chairman's address: “The education of professional electrical engineers” |
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Journal of the Institution of Electrical Engineers,
Volume 74,
Issue 445,
1934,
Page 70-75
G.D.Aspinall Parr,
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PDF (928KB)
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DOI:10.1049/jiee-1.1934.0011
出版商:IEE
年代:1934
数据来源: IET
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| 12. |
Dundee Sub-Centre: Chairman's address: “The college portion of an electrical engineer's education” |
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Journal of the Institution of Electrical Engineers,
Volume 74,
Issue 445,
1934,
Page 76-79
W.M.Mackay,
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PDF (651KB)
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DOI:10.1049/jiee-1.1934.0012
出版商:IEE
年代:1934
数据来源: IET
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| 13. |
Tees-side Sub-Centre: Chairman's address. “Progress in electrcity supply” |
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Journal of the Institution of Electrical Engineers,
Volume 74,
Issue 445,
1934,
Page 79-83
R.J.Huntley,
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PDF (774KB)
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DOI:10.1049/jiee-1.1934.0013
出版商:IEE
年代:1934
数据来源: IET
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| 14. |
Sheffield Sub-Centre: Chairman's address: “The broader aspects of supplying electricity” |
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Journal of the Institution of Electrical Engineers,
Volume 74,
Issue 445,
1934,
Page 84-85
E.Morgan,
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PDF (287KB)
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DOI:10.1049/jiee-1.1934.0014
出版商:IEE
年代:1934
数据来源: IET
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| 15. |
Some experiments upon the carbon microphone |
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Journal of the Institution of Electrical Engineers,
Volume 74,
Issue 445,
1934,
Page 86-97
D.N.Truscott,
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PDF (1377KB)
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摘要:
The paper describes experiments upon a granular carbon microphone, conducted at known amplitudes of vibration of the diaphragm. The results show that the output is determined by six variables, namely:—Amplitude of vibration; frequency of vibration; resistance of microphone; temperature of microphone; feed current of microphone; arrangement of granules.It is shown that the effect of the last is very much less than has previously been supposed, being of the order of ± 10 percent at 50 mA feed current, and increasing with the feed current. The curves obtained are found to be constant for long periods of time, and they therefore represent characteristics by which microphones may be compared.An experiment upon the conductivity/separation relation for two granules, indirectly supported by recent theoretical work in wave mechanics, together with the other experiments, leads to the hypothesis that the action of the granules is to be regarded as a simple make-and-break effect at each contact.A complete bibliography is appended.
DOI:10.1049/jiee-1.1934.0015
出版商:IEE
年代:1934
数据来源: IET
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Volume 74 issue 445