Journal of the Illuminating Engineering Institute of Japan

Abstracts of Current

1929 Volume 13 Issue 2 Pages 1-14
Published: 1929
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.2150/jieij1917.13.2_1

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News of Illuminating Field

1929 Volume 13 Issue 2 Pages 85-86
Published: 1929
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.2150/jieij1917.13.2_85

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Presidential Adress

T. Motono

1929 Volume 13 Issue 2 Pages 87-89
Published: 1929
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.2150/jieij1917.13.2_87

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Discrimination of Materials by Ultra-Violet Rays

H. Takaoka

1929 Volume 13 Issue 2 Pages 90-93
Published: 1929
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.2150/jieij1917.13.2_90

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This is the abridgement of the paper read before the meeting of the Kwansai Section of the Illuminating Engineering Society, and deals with the discrimination, by ultra-violet rays, of fancy goods, fibrous materials, food stuffs, oils, chemicals and dyes.

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Some Abridged Notes on the 100-110V Neon Glim Lamp

S. Bekku, Z. Yamauti, T. Aikawa, M. Okamatsu, Y. Omoto, M. Hoshiai

1929 Volume 13 Issue 2 Pages 94-123
Published: 1929
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.2150/jieij1917.13.2_94

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Not merely as an illuminant, but also as a handy vacuum discharge tube, the Neon Glim Lamp has been received with much interests by many physicists and engineers. The present paper is the collection of the fragmental notes about the lamp got in the course of reserches which were performed in order to apply it for various purpores.

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On the Color Emissivity

S. Abe

1929 Volume 13 Issue 2 Pages 124-125
Published: 1929
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.2150/jieij1917.13.2_124

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In this paper, the author describes that the relation between the Crova wave-length of any substance and that of the black body is expressed by a mathematical formula and that the color emissivity of the substance is easily determined by using the formula.

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ASimpler Derivation of the Relation, E=b/2∫cosδdθ

Y. Omoto

1929 Volume 13 Issue 2 Pages 126-128
Published: 1929
Released on J-STAGE: June 08, 2011

DOIhttps://doi.org/10.2150/jieij1917.13.2_126

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It is shown, in a simple manner, that the illumination E, at a point P on a plane C, due to an extended light source S, of uniform brightness b, is given by E=b/2∫cosδdθ, where the integration is to be performed along the entire boundary of S, δ being the angle, on the side opposite with S, between the plane C and the plane determined by the point P and the line element ds of the boundary curve of S, and dθ being the elementary angle subtended by ds at P.
The above relation was rigorously proved by Z. Yamauti, by means of Stokes' theorem, whereas the present author gives an easy derivation of the same result, without recource to higher mathematics.

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On Standard Illumination Intensity of Factory

Gansei Doi

1929 Volume 13 Issue 2 Pages 129-136
Published: 1929
Released on J-STAGE: October 27, 2010

DOIhttps://doi.org/10.2150/jieij1917.13.2_129

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As it is reasonable that illumination intensity at working plane considered referring to the relation between light and fatigue, standard illumination intensity of factory must be agreed upon the working hours. Recent observation of factory illumination in our country and some other investigations on this problem are evidences to this fact.

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