摘要:

A curved‐crystal spectrometer has been designed with all the mechanism except the crystal and detector arms contained in a box 6×7×3½ inches. Three sets of arms are provided for focusing circles of 10‐, 20‐, and 40‐cm radius. Either automatic drive at from ½ to 8 degrees 2&thgr; per minute or manual scanning may be used. Precision‐cut commercial gears result in accurate positioning and less than 0.01° 2&thgr; backlash in the drive mechanism. Thus the spectrometer is satisfactory for use with rather perfect crystals such as quartz as well as with the alkali halides. Interchange of crystals and alignment of new crystals is simple and rapid.

ISSN:0034-6748    

DOI:10.1063/1.1716214

出版商:AIP    

年代:1958

数据来源: AIP

摘要:

A respirator with cycling rates from 5 to 80 cycles per minute is described. The inspiration‐expiration ratio is adjustable. Four animals may be respirated simultaneously. Operation is quiet, with only one moving part in the multiple valve assembly. Manual operation is possible in event of power failure.

ISSN:0034-6748    

DOI:10.1063/1.1716215

出版商:AIP    

年代:1958

数据来源: AIP

摘要:

A quartz spring balance is described which can be used to measure the magnetic susceptibility of submilligram amounts of sample. The magnetic field is supplied by a moving permanent magnet, and the susceptibility is determined by the deflection of the spring observed in a measuring microscope. The apparatus is calibrated by a comparison standard (platinum) and results are shown for platinum, nickel aluminate, lead, manganese, and sucrose. A precision of better than 2% can be obtained on submilligram amounts of paramagnetic substances having a magnetic susceptibility of from 1 to 50×10−6emu/g. On weakly paramagnetic or diamagnetic substances comparable precision can be obtained on less than 10 mg amounts of sample.

ISSN:0034-6748    

DOI:10.1063/1.1716216

出版商:AIP    

年代:1958

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1716218

出版商:AIP    

年代:1958

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1716219

出版商:AIP    

年代:1958

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1716220

出版商:AIP    

年代:1958

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1716221

出版商:AIP    

年代:1958

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1716222

出版商:AIP    

年代:1958

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1716224

出版商:AIP    

年代:1958

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1716226

出版商:AIP    

年代:1958

数据来源: AIP