The general relation between the amount of light a Id its effect on the photochemical change has not yet been quantitatively established.
Accordingly, it is very difficult to know the same relation exactly in the case of photographic dry plates which have very complicated composition. But, as the photography has a long history in its practical side, it is now completely known how much exposure to be given to get a good negative in the practice. The outline of the relation between the amount of light and its effect for the photo-graphic dry plates was discussed in the present lecture.

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This is an abstract of the lecture made at the commemorating lecture meeting of the Light Golden Jubilee in Tokyo, and describes some historical notes on the development of lamp manufacture, in which the author treats with his own experience in the Tokyo Electric Company. Starting from the development of carbon filament he explains the researches on leading-in wires, tungsten filament and gasfilled lamps, and in conclusion he express his hope for the glow lamp development as well as that of incandescent lamp.

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It is well known that the Neon Glim Lamp has been used for various purposes not only as an illuminant, but also as a glow discharge tube. In this paper, some characteristics on the glow discharge of the so called “Fluorescence Lamp” (which is a Nitrogen-Argon gasfilled Glim Lamp) are given, with special reference to the periodic flashing phenomena.
It is pointed out that the dynamic effective resistance between the negative glow and the anode is affected by the condenser connected in parallel with the lamp. The effect of the condenser capacity on the critical limit of the intermittent scillations produced by the periodic flashing is fully discussed. The critical capacity is given by the following equation: Cp ≥ A(E-ν2)/R(ν2-ν0) where P and A are constants which can be determined by experiments. E is the impressed d. c. voltage, and v₂ is the dynamic extinction voltage, and v₀ the cathode fall of potential.
A method of determination of the dynamic extinction voltage by experiment is proposed. Some abridged notes on this lamp are also collected.

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La Japana Komisiono Iluminteknika proponu al 1a Ititernacia Kongreso Iluminteknika, kiu havos lokon je La, venonta autunb en Anglujo, por ke gi permesu Esperanton kiel sia lingvo oficiala, mi deziras.
Kaj mi kore esperas miajn samideanbjn kunklopodi en la afero.

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