巻号一覧
後続誌
12 巻, 9 号
選択された号の論文の7件中1～7を表示しています
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1928 年 12 巻 9 号 p. 89-97
発行日: 1928年
公開日: 2010/10/27
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1928 年 12 巻 9 号 p. 572
発行日: 1928年
公開日: 2010/10/27
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黒澤 凉之助1928 年 12 巻 9 号 p. 573-589
発行日: 1928年
公開日: 2010/10/27
ジャーナル フリーIT is said that, the light intensity of a globe in some direction is given, if it be made of perectly diffusing material, by bA (θ), where b denotes its brightness and A (θ) its projected area in the directien, or else, if it be made of perfectly non-diffusing material, by η*i (e), where i (8) is the light intensity of the working lamp in the direction and η* some proper positive fraction.
But these are true only for ideal cases, which, by the author's opinion, are two extremities of real cases. Then he has assumed as following:
where k1 and k2 are some positive fractions which are to be summed up to unity.
The quantities I (θ) and i (θ) are to be obtained by ordinary photometry, and A (θ)'s are measured from the photographes of projections (shown in Fig.3's). So then k1b and k2η* can be determined, and to this end he escheemed method of “Uchisaka-curve” (as shown in Fig. 2's), which was named so in honor of his old teacher, Mr.Motowo Uchisaka.
This paper is the first report of the studies on light distributions of globes, by the above opinion, about various specimens.
Postscriptly, he introduces “diffusing power” which was defined by Dr. Halbertsina as “Lichtstreuvermogen, ” which has scarcely been known in Japan, and also the author's method to measure it.抄録全体を表示PDF形式でダウンロード (20840K) -
1928 年 12 巻 9 号 p. 583a
発行日: 1928年
公開日: 2010/10/27
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十合 晋次1928 年 12 巻 9 号 p. 590-605
発行日: 1928年
公開日: 2010/10/27
ジャーナル フリーThe electric resistances of some heating wires are measured by the potentiometer method. For the purpose of protecting the specimen from the oxidation it is put in a quartz tube which is filled with the nitrogen gas, and heated slowly by the electric furnase up to 1000°C and then cooled again to the room temperature. This proeess is repeated twice for each specimen.
The first heating curve differs from the first cooling curve depending upon the initial heat treatment of the wire, but the second two curves coinsize to the first cooling curve because of the annealing effect. The specific resistance and the temperature coefficient are calculated from the second curve.
From this result it is concluded that;
(1) the specific resistance and the temperature coefficient at the straight line part of the curve of the heating wire for low temperature use are greater than those of the wire for the high temperature use,
(2) the transposition part of the curve of the wire for the low temperature use is smoother than that of the wire for high temperatureuse.
(3) the total incresnment of resistance in percent. at any temperature has the greater value for the wire of low grade than for the wire of high grade.抄録全体を表示PDF形式でダウンロード (1481K) -
1928 年 12 巻 9 号 p. 606-615
発行日: 1928年
公開日: 2010/10/27
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1928 年 12 巻 9 号 p. plate1-plate4
発行日: 1928年
公開日: 2010/10/27
ジャーナル フリーPDF形式でダウンロード (13580K)
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