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11. |
The High Frequency Magnetic Field of a Flat Spiral Coil |
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Review of Scientific Instruments,
Volume 4,
Issue 10,
1933,
Page 542-545
Sherwood Githens,
Otto Stuhlman,
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PDF (201KB)
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摘要:
The high frequency magnetic field of a flat spiral coil, with an inner opening about one‐fourth the diameter of the coil, was excited by single‐tube tuned plate‐tuned grid and push‐pull oscillators. Frequency range 1500 to 6000 kc/sec. The magnetic fields thus excited were compared with the fields produced by a direct current. The results when a push‐pull oscillator was used to excite the high frequency field showed no apparent difference, except near the far edges lying about 25 cm from the center of the coil, and were independent of frequency.Unbalanced high frequency excitation showed magnetic field crowded toward the normal axis when filament lead was connected to inner turn of spiral. Field strength across inner diameter was found to be non‐uniform when field was excited by a balanced push‐pull oscillator. Field strength along normal axis of coil diminished more rapidly for a balanced than for unbalanced excitation, independent of method of lead connections and was much smaller for the case of filament lead connected to outer end of spiral.
ISSN:0034-6748
DOI:10.1063/1.1748996
出版商:AIP
年代:1933
数据来源: AIP
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12. |
An Electromagnetic Balance |
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Review of Scientific Instruments,
Volume 4,
Issue 10,
1933,
Page 546-548
D. S. Ainslie,
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PDF (160KB)
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ISSN:0034-6748
DOI:10.1063/1.1748997
出版商:AIP
年代:1933
数据来源: AIP
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13. |
A New Form of a Dew‐Point Hygrometer |
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Review of Scientific Instruments,
Volume 4,
Issue 10,
1933,
Page 549-550
S. R. Williams,
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PDF (161KB)
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摘要:
Because of difficulties in securing consistent results with the Alluard form of dew‐point hygrometer, a new form has been suggested. The important features of the new form are the small heat capacity of the dew forming surface, a polished concave surface in which the spot of dew forms and the application of a thermocouple to the measurement of the temperature at which the dew forms.
ISSN:0034-6748
DOI:10.1063/1.1748998
出版商:AIP
年代:1933
数据来源: AIP
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14. |
ABSTRACTS OF INSTRUMENTS LITERATURE |
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Review of Scientific Instruments,
Volume 4,
Issue 10,
1933,
Page 551-555
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PDF (365KB)
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ISSN:0034-6748
DOI:10.1063/1.1748999
出版商:AIP
年代:1933
数据来源: AIP
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15. |
Notes |
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Review of Scientific Instruments,
Volume 4,
Issue 10,
1933,
Page 560-561
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PDF (126KB)
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ISSN:0034-6748
DOI:10.1063/1.1749000
出版商:AIP
年代:1933
数据来源: AIP
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