ISSN:0034-6748    

DOI:10.1063/1.1752092

出版商:AIP    

年代:1936

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1752093

出版商:AIP    

年代:1936

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1752094

出版商:AIP    

年代:1936

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1752095

出版商:AIP    

年代:1936

数据来源: AIP

摘要:

Many radio broadcasting transmitters are equipped with modern temperature controlled crystal controlled oscillators so that these sources of alternating current of constant high frequency would be readily available for use in laboratory measurements were it not for the presence of modulation by program material. Two methods for removing this modulation are described. The first employs an oscillator type circuit that is actuated by the incoming radio signal. It has the virtue of simplicity but is not stable in operation. The second method employs a demodulating amplifier that delivers to a low loss tuned circuit pulses of energy that are almost independent of the modulation. This circuit is stable and does not require adjustment after once having been put in operation on a signal of given frequency. Distorted wave forms appear only when the radio broadcast signal carries modulation approaching or exceeding 100 percent.

ISSN:0034-6748    

DOI:10.1063/1.1752096

出版商:AIP    

年代:1936

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1752097

出版商:AIP    

年代:1936

数据来源: AIP

摘要:

Attention is directed toward the difference between induction‐coercive force and magnetization‐coercive force. Although the former is used more commonly the latter appears to have a more fundamental significance, so that a consideration of its meaning has led to a rapid, direct method for determining coercive force. An apparatus is described with which this method is used to determine rapidly the coercive force of solid and granular samples. Advantages of this method and apparatus are discussed.

ISSN:0034-6748    

DOI:10.1063/1.1752098

出版商:AIP    

年代:1936

数据来源: AIP

摘要:

The theory of magnetic field production by a limited number of circular current loops with a common axis is briefly restated. The previously known particular solutions for two, four (or three), six and eight loops are recomputed and some new solutions of special interest are given. Expansions of surface zonal harmonics and of their first derivatives, up to the twelfth order, are included.

ISSN:0034-6748    

DOI:10.1063/1.1752099

出版商:AIP    

年代:1936

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1752100

出版商:AIP    

年代:1936

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1752101

出版商:AIP    

年代:1936

数据来源: AIP