摘要:

This paper is a review of the various types of beta‐ray spectrographs and spectrometers. The principal theoretical results as to the resolving power and luminosity attainable under various conditions are briefly related. Finally the construction and performance data of a number of instruments described in the literature are collected, and compared by means of a graphical representation.

ISSN:0034-6748    

DOI:10.1063/1.1745497

出版商:AIP    

年代:1950

数据来源: AIP

摘要:

It is suggested that the fraction of the beam in a betatron or synchrotron that is lost by striking the injector might be decreased by a suitable transient bending of the steady‐state orbit during injection.

ISSN:0034-6748    

DOI:10.1063/1.1745498

出版商:AIP    

年代:1950

数据来源: AIP

摘要:

An electrical computor for determining the eigenvalues and eigenvectors of real symmetric matrices up to the tenth order is described. It is an enlarged and an improved form of a computor described in a previous paper. The time required for solution is considerably reduced, and the accuracy is ten times higher. The solution of a matrix of the tenth order takes four hours, as compared to a hundred hours by computational methods. The accuracy of the eigenvalues is about 0.01 percent of the difference between the greatest and smallest eigenvalues, and the accuracy of each eigenvector is better than one percent of its greatest component.

ISSN:0034-6748    

DOI:10.1063/1.1745499

出版商:AIP    

年代:1950

数据来源: AIP

摘要:

A coincidence circuit using the traveling wave principle as applied to distributed amplification is described. The resolving time is about 10−8sec. when the device is used in connection with scintillation detectors.

ISSN:0034-6748    

DOI:10.1063/1.1745500

出版商:AIP    

年代:1950

数据来源: AIP

摘要:

A particularly simple cloud chamber is described that is continuously sensitive to ion tracks. The chamber operates on the principle of vapor diffusion from a hot to a cold surface. The sensitive region is a shallow horizontal layer near the cold surface. The chamber has been placed in a magnetic field and curved tracks of &bgr;‐particles from a radioactive source have been photographed. Pictures of such electron tracks are shown.

ISSN:0034-6748    

DOI:10.1063/1.1745501

出版商:AIP    

年代:1950

数据来源: AIP

摘要:

An apparatus is described the basic element of which is a microscope with a motor‐driven stage. The operator controls the direction and speed of motion by a steering wheel and an accelerator pedal and drives the track to be analyzed through a target. Range, grain density, and geometrical orientation of tracks, etc., are automatically recorded on charts. Methods of measurements and results are discussed.

ISSN:0034-6748    

DOI:10.1063/1.1745502

出版商:AIP    

年代:1950

数据来源: AIP

摘要:

The description of the performance of a double thin magnetic lens beta‐ray spectrometer is given. A detailed investigation of the separate distortions introduced by chamber misalignment, internal scattering, charged source and poor resolution has been made, and the results are presented qualitatively. An alignment procedure is presented, and also the arrangement of baffles to minimize scattering.

ISSN:0034-6748    

DOI:10.1063/1.1745503

出版商:AIP    

年代:1950

数据来源: AIP

摘要:

The following types of continuously sensitive diffusion cloud chamber have been built and successfully operated: a chamber designed to be photographed through the top for use with a particle accelerator; a chamber designed to be photographed from the side for cosmic‐ray studies; and a very simple chamber for demonstration purposes. The construction and best operating conditions are described.

ISSN:0034-6748    

DOI:10.1063/1.1745504

出版商:AIP    

年代:1950

数据来源: AIP

摘要:

A method is described whereby resistance‐temperature tables can be calculated in a few hours using punched cards. The method is much simpler and quicker to use than the ``platinum temperature'' tables. An example is given for reducing resistance measurements to temperature and a method for checking bridge and thermohm drift with respect to the tables is proposed.

ISSN:0034-6748    

DOI:10.1063/1.1745505

出版商:AIP    

年代:1950

数据来源: AIP

摘要:

An electronic recording analytical balance is described which is free of mechanical connections with the balance beam, direct reading, sensitive, and rapid. All mechanical and electrical contactors have been eliminated from the instrument proper, using electronic means as a substitute for mechanical. A relay and two cam‐operated microswitches are, however, used in the range extender. The construction is simple, being made up, for the most part, of available standard commercial units. For work requiring a continuous record of changes in weight with respect to time, the instrument should prove to be most valuable.

ISSN:0034-6748    

DOI:10.1063/1.1745506

出版商:AIP    

年代:1950

数据来源: AIP