ISSN:0034-6748    

DOI:10.1063/1.1770050

出版商:AIP    

年代:1942

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1770051

出版商:AIP    

年代:1942

数据来源: AIP

摘要:

Three general types of WPB regulations are presented: (1) Those which deal with priorities and preference ratings (P‐43, P‐100, P‐90, and forms PD‐1A and PD‐25A); (2) Limitation Order L‐144; and (3) Priorities Regulation No. 10. P‐43 assigns a blanket preference rating of A‐2 to purchases by certain research laboratories; P‐100 assigns an A‐10 rating to the purchase of supplies by certain ``producers'' including educational institutions; P‐90 sets up the Production Requirements Plan under which certain producers must and others may operate, obtaining priorities assistance through the use of Form PD‐25A; Form PD‐1A may be used to apply for priorities assistance in securing required material and equipment not covered in other plans. Limitation Order L‐144 limits the purchase of laboratory equipment containing critical materials to certain specified users and to users specifically approved by the WPB Supplementary rulings and unofficial interpretations have been obtained concerning L‐144. Priorities Regulation No. 10 sets up an allocation classification system whereby certain symbols must be added to orders indicating the end use of the material being purchased.

ISSN:0034-6748    

DOI:10.1063/1.1770052

出版商:AIP    

年代:1942

数据来源: AIP

摘要:

An a.c.‐operated instantaneous reading x‐ray dosimeter for use with both hard and soft radiation is described. The instrument requires calibration against a standard.

ISSN:0034-6748    

DOI:10.1063/1.1770053

出版商:AIP    

年代:1942

数据来源: AIP

摘要:

Transparent, plastic films of silver chloride can be obtained by rolling fused silver chloride. Such films show high transmission for infra‐red radiation and can be used as windows for infra‐red absorption cells.

ISSN:0034-6748    

DOI:10.1063/1.1770054

出版商:AIP    

年代:1942

数据来源: AIP

摘要:

An instrument is described which measures the intensity of the high frequency electric field, point by point, by means of the electrodeless discharge and a photoelectric device. The instrument is applicable to dosimetry and for local measurements in short wave therapy, but can also find application for investigation on insulators and other parts exposed to high voltage. The operation of the instrument and some examples of results obtained with the instrument are stated.

ISSN:0034-6748    

DOI:10.1063/1.1770055

出版商:AIP    

年代:1942

数据来源: AIP

摘要:

An apparatus is described which provides arcing facilities for twelve samples without the necessity of removing the electrodes. The lower electrodes rotate during arcing. All controls for selecting the electrode pairs and for vertical and horizontal adjustment are insulated and are located outside a safety cage which must be completely closed before application of the high voltage is possible. Contamination is prevented by adequate ventilation.

ISSN:0034-6748    

DOI:10.1063/1.1770056

出版商:AIP    

年代:1942

数据来源: AIP

摘要:

This paper describes a combined magnet and dilatometer for simultaneously tracing the changes in magnetization and dilation of alloys undergoing phase transformations. Measurements may be made while the specimen is being heated to, held at, or cooled from the reaction temperature. The apparatus has been applied particularly to the study of the structural changes which occur during the tempering of hardened steel. Typical results for a plain carbon steel are included.

ISSN:0034-6748    

DOI:10.1063/1.1770057

出版商:AIP    

年代:1942

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1770058

出版商:AIP    

年代:1942

数据来源: AIP

摘要:

The method of design followed in the construction of a permanent magnet containing 450 pounds of red dot Alnico and having a total mass of about 3000 pounds is reviewed. The magnet can produce fields which are permanent and highly homogeneous and of any magnitude up to about 3000 oersteds in a gap8′′×16′′×1916′′. The moderate cost and excellent performance of the installation indicate that such magnets should be useful for numerous applications. A photographic type spectrograph is described, which is suitable for the study of internally converted electrons. To render quantitative comparisons of electron intensities feasible, the photographic action of &bgr;‐rays has been investigated. Examination of &bgr;‐spectra emitted by naturally radioactive elements indicates that the performance of the spectrograph is quite satisfactory.

ISSN:0034-6748    

DOI:10.1063/1.1770059

出版商:AIP    

年代:1942

数据来源: AIP