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Volume 4 (1956)
- Issue 4 Pages 3-
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Volume 4, Issue 4
Displaying 1-4 of 4 articles from this issue
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Etienne Vassy1956 Volume 4 Issue 4 Pages 3-8
Published: September 01, 1956
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (3555K) -
Shigeru OTSUKA1956 Volume 4 Issue 4 Pages 9-28
Published: September 01, 1956
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSIn measuring the picture tube luminescent colour, Hitachi's photoelectric spectrophotometer was used and for the compensation of fatigue characteristics of photoelectric multiplier, which was used as a photoreceiver, flicker method by colorimet y sample and auxiliary standard lamp was adopted. For luminescence under a certain exciting condition, energy distribution of excellent reproducibility was obtained, from which trichromatic coefficient was calculated by weighted method (10mμ divi-sion) with deviations of Sx=0.24% and Sy=0.24% from the average figure.
As an application, by using a commercial TV set the change in luminescence chromaticity of mixed sulphide phosphor (p.4) was examined in two cases by changing first the exciting condition and next the thickness of fluorescent coating. The result confirms that the change is due to, the difference in individual characteristics of each of the fluorescent substances used in the mixture, the first case by the difference in current saturation phenomenon and the second due to the absor-ption of blue spectrum by yellow constituents.
In addition, it was observed that the colour of fluorescent substance itself has a remarkable influence on. yellow edge and center trouble.View full abstractDownload PDF (2552K) -
Eiiti MINAMI, Shuji ABE, Shinji TAKAGI1956 Volume 4 Issue 4 Pages 29-32
Published: September 01, 1956
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSSpectroscopic carbon electrodes contain frequently small amount of fluorine as impurity, and special attention should be paid for detection and estimation of this element if spectrochemically analysed. 24 samples of domestic and foreign made carbon electrodes are tested by spectroscopic analysis using CaF-emission band spectrum (b. h. 5291A).
Four of them had no trace of detectable fluorine and the arc was stable. They were fit for use. Other four samples contained some amounts of fluorine (0. 001∼0.1% F) but the arc was stable.
In the rest of the samples fluorine was not detected but the arc was very unstable.
The causes which affect the stability of the arc may be the graphitization-degree of the carbon and other impurities.View full abstractDownload PDF (414K) -
Mitsuyoshi SHIMAZU, Kouichi YOSHINO, Sadao SANO, Hiroshi MATSUI1956 Volume 4 Issue 4 Pages 33-42
Published: September 01, 1956
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSCo-operative investigations of quantometric analysis of lead alloys has been carried out by Furukawa Electric Co., Yokohama Works and the Kawasaki Branch of Industrial Research Institute of Kanagawa Prefecture, using ARL's Industrial Research Quantometer. Up to the present time, the method of chemical analysis has generally been adopted for the inspection of raw materials and products. The present investigations were initiated to establish the method of quantometricanalysis of lead alloys in order to increase the efficiency of these inspections.
The object of this investigation was to analyse Pb-Sb, Pb-Sn binary alloys, Pb-Sb-Sn ternaryalloy etc. The studies were first carried out for simple binary alloys, and then for ternary alloy.
The analytical line pairs Sb I 2598.06/Pb I 4057.82 and Sn I 3262.3/Pb I 4057.82 were used under the source condition of Multisource low voltage spark L=130μH, C=5μF, R=100Ω, V=940 V in the case of binary alloys. No effect of surface finish and surface oxidation of the sampleswas found under the experimental conditions used.
The method thus established was then applied to the inspection of raw materials and products. About 200 samples of Pb-Sb alloy, and 300 samples of Pb-Sn alloys were analyzed quantometrically and were compared with the results of chemical analysis.
In the case of Pb-Sb ingot samples (Sb 0.8-0.9%) and Pb-Sn ingot samples (Sn 1.9-2.0%), the method was practically applicable. It was found, however, in the case of lead sheath, deviations of quantometric analysis from the chemical value were rather large, and therefore further studies seem to be necessary.
The accuracy of the quantometric analysis was 3-5% for Pb-Sb ingot and Pb-Sb cable sheath, 1-2% for Pb-Sn ingot, and 2-3% for Pb-Sn c ble sheath.
Studies were then carried out for Pb-Sb-Sn ternary alloy, to determine not only the major constituents Sb and Sn but also Cu which is occasionally contained as impurity. The analytical line pairs used in this case were Sb I 2598.06/Pb I 4057.82, Sn I 3262.3/Pb I 4057.82 and Cu I 3274. 0/Pb I 4057.82 under the source condition of high voltage spark V=20KV, C=0, 007μF, L=OμH. The precision of the analysis was 2-4% for 0.26-0.28% Sb, 3-5% for 1.50-2.23% Sn and 3-5% for 0.011-0.012% Cu.View full abstractDownload PDF (1238K)
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