ISSN:0034-6748    

DOI:10.1063/1.1752389

出版商:AIP    

年代:1938

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1752390

出版商:AIP    

年代:1938

数据来源: AIP

摘要:

An apparatus containing a cathode‐ray oscillograph has been developed for the measurement of positions of x‐ray diffraction lines. A small portion of the film is scanned by a moving slit. A trace of film transmissionversusdistance appears on the screen of the oscillograph. Lines are easily measured by centering their traces on the screen. Measurements are made very rapidly. Accuracy depends on the sharpness of the line measured. Ordinary back‐reflection x‐ray lines can be measured to better than 0.02 mm, sharper lines or points may be located much more accurately. The apparatus is compact and has no parts easily damaged. The cost is less than for a recording photo‐densitometer. It can, no doubt, be used for intensity measurements and for the measurement of spectrographic and other types of lines on photographic plates or films.

ISSN:0034-6748    

DOI:10.1063/1.1752391

出版商:AIP    

年代:1938

数据来源: AIP

摘要:

A vacuum tube for the acceleration of charged particles is described. The total acceleration of the ions takes place in a distance of 18 inches although the total height of the tube is about 14 feet. It has been used at one million volts peak a.c. with target currents of 5 ma of electrons and 0.2 ma of positive ions.

ISSN:0034-6748    

DOI:10.1063/1.1752392

出版商:AIP    

年代:1938

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1752393

出版商:AIP    

年代:1938

数据来源: AIP

摘要:

A gaseous flow meter of the hot wire type with a linear response may be obtained by causing the gaseous flow to effect a transfer of heat between two adjacent heated grids.

ISSN:0034-6748    

DOI:10.1063/1.1752394

出版商:AIP    

年代:1938

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1752395

出版商:AIP    

年代:1938

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1752396

出版商:AIP    

年代:1938

数据来源: AIP