摘要:

A mechanical labor‐saving device is described for converting two curves with differing ordinate and/or abscissal values to identical scales in the two axes, and for quantitatively subtracting such curves. Since the various uses of the appliance depend upon its ability to convert different ordinate values to the same scale, it is called a coordirectograph.

ISSN:0034-6748    

DOI:10.1063/1.1752025

出版商:AIP    

年代:1936

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1752026

出版商:AIP    

年代:1936

数据来源: AIP

摘要:

A method is described for high resistance measurement which depends essentially on the fact that a small capacitanceC,charged and dischargedntimes per second, is equivalent to a high resistance 1/nCohms if the pulsating current is smoothed by a larger capacitance. Upon placing the ``equivalent high resistance 1/nC'' and unknown high resistanceR,in two arms of a Maxwell bridge, it is shown that at balance,Ris given by the familiar bridge equation:R=(1/nC)R1/R2. The method has been used to check the constancy of several electrolytic resistors three years old. It was found, for a resistance of the order of 108ohms, that no change was detectable within 0.1 percent; for resistors of the order of 1010ohms, a decrease of about 3 percent was noted.

ISSN:0034-6748    

DOI:10.1063/1.1752027

出版商:AIP    

年代:1936

数据来源: AIP

摘要:

Three spectroscopic methods of exciting spectra have been examined as possible sources of positive rays. The vacuum vibrator, a mechanically interrupted low potential spark, has been found to give positive ions although the source is not constant. The discharge of a large condenser charged to 60 kilovolts between metal electrodes, has been found unsatisfactory as a source of positive ions. A high frequency alternating spark coupled inductively to a primary oscillating spark circuit, is a strong convenient source. The ions may be accelerated to form a beam, and, with the Thomson parabola method of analysis, it has been found that multiply charged ions of the electrode elements are formed in all cases tried.

ISSN:0034-6748    

DOI:10.1063/1.1752028

出版商:AIP    

年代:1936

数据来源: AIP

摘要:

An arrangement is described which permits unusually accurate measurement of high voltage current characteristics and breakdown potentials of liquid dielectrics with direct current. Currents from 10−16ampere to 10−3ampere may be measured up to 40 kv. Protective devices are incorporated which prevent damage to the sample measured and to the instruments when breakdown occurs.

ISSN:0034-6748    

DOI:10.1063/1.1752029

出版商:AIP    

年代:1936

数据来源: AIP

摘要:

A high voltage electrostatic belt‐type generator has been built, in which nearly horizontal ropes are used for support instead of the usual vertical supporting textolite cylinder. This new arrangement turns surfaces with maximum radius of curvature towards the shortest gaps, above and below. Evidence is presented to show that this arrangement gives the maximum voltage for a room with limited height.

ISSN:0034-6748    

DOI:10.1063/1.1752030

出版商:AIP    

年代:1936

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1752031

出版商:AIP    

年代:1936

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1752032

出版商:AIP    

年代:1936

数据来源: AIP