摘要:

A wave analyzer is developed by replacing all moving parts and contacts of the original Joubert disk by electronic means. The wave analyzer is able to provide a point by point delineation of such wave shapes as are not easily accessible to the oscillograph. Circuits and operation of the wave analyzer are described and two examples of application in the field of gas discharge research are given.

ISSN:0034-6748    

DOI:10.1063/1.1751488

出版商:AIP    

年代:1939

数据来源: AIP

摘要:

An apparatus for the bombardment of small samples with electrons of 1 to 15 electron kilovolts energy has been developed and used. Special features render it particularly suited to a study of those biological materials which can tolerate high vacuum. The details of the construction and operation of the tube and of auxiliary apparatus are described.

ISSN:0034-6748    

DOI:10.1063/1.1751489

出版商:AIP    

年代:1939

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1751490

出版商:AIP    

年代:1939

数据来源: AIP

摘要:

A radiobarograph is described, which is accurate to 1 mm Hg pressure. This instrument employs a suspension giving increased sensitivity at low pressures, and rendering it free from backlash. Various tests on this barograph are described.

ISSN:0034-6748    

DOI:10.1063/1.1751491

出版商:AIP    

年代:1939

数据来源: AIP

摘要:

A simple, all‐purpose oscillator of the negative resistance type called the ``transitron'' oscillator is described. The simplicity of the circuit is such that with the data included herein one may construct the oscillator in a minimum of time and with little effort. Possessing exceptionally good wave form with the attendant efficiency in keeping its frequency from drifting once a definite frequency of oscillation is selected, the oscillator should find favor in general physics laboratories. The versatility of the device lends itself to application in many types of physical research, some of which are described, as well as to the construction of standard physics laboratory apparatus requiring an oscillator as a component part. Use of the oscillator is recommended in medical, biological, psychological, and other fields of research where a source of low voltage at variable frequency is often desired and where the simplicity of the device should be of great help.

ISSN:0034-6748    

DOI:10.1063/1.1751492

出版商:AIP    

年代:1939

数据来源: AIP

摘要:

A new type of bridge detector is described which has almost constant sensitivity in the frequency range 25 cycles to 70,000 cycles, and which is simple to operate, rugged, and stable.

ISSN:0034-6748    

DOI:10.1063/1.1751493

出版商:AIP    

年代:1939

数据来源: AIP

摘要:

Supersaturation necessary for condensation of a vapor upon ions is maintained continuously by the diffusion of an initially warm saturated vapor through a noncondensing gas into a refrigerated region. Convection is avoided by diffusion vertically downward between a horizontal heated roof and refrigerated floor. Calculations show what flux of vapor and what roof and floor temperatures are necessary. Experiment shows that this diffusion cloud chamber operates as expected, and with reasonable precautions it is quite stable against turbulence. Successful operation depends on avoiding production of condensation nuclei which will make a diffuse rain of condensation in the chamber. Vapor from liquid in a glass flask heated by radiation from above has been found to be practically free of aggregates. The chamber cannot produce satisfactory ion tracks in the presence of too great an average ion load. In the steady‐state operation of the present apparatus the normal background ionization without shielding loads the chamber so close to its limit that most tracks are diffuse. When first applying refrigeration there is a transient condition in which many more tracks are well defined. There are several possible ways of improving the steady‐state ion load capacity of the apparatus.

ISSN:0034-6748    

DOI:10.1063/1.1751494

出版商:AIP    

年代:1939

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1751486

出版商:AIP    

年代:1939

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1751487

出版商:AIP    

年代:1939

数据来源: AIP