In this paper it is described that the relation curve may be expressed by a proportional forbetweenthe Crova wave-length of an incandescent mula. body and the center of gravity of its luminosity

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In this paper, the term “colour” is used in itsbroader sense, embracing all visual qualities withinits meaning. For the three at tributes of colour, the words, brilliance, hue, and saturationare employed.
An attempt has been made to describe, classify, and comment upon various systems of colournomenclature and to indicate the usefulness andlimitations of various colorimeters and spectrophotometers.
In selecting a colour for a given purpose, suitability, durability, costs, and uniformity of supplyare the chief consideration.
Colour standardization in railways requires forits accomplishment co-operation and a certaindegree of appreciation in colour science, by workersin different lines of the business.
The writer is of the opinion that the mostpractical method for standardizing colours ofpainted surfaces is to prepare actual surfaces inthe form of painted colour chips, and to distributethem as material standards for colour matching.
Readings of the colour standards upon a suitablespectorophotometer are taken under given conditionsof illumination and observation, so thatthe reproduction of the standards may be verifiedwithout depending on the permanence of thematerial originally used. He believes that thedata obtained by reading a colour upon analyticalcolorimeters, e. g., Pulfrich stage photometer, maybe made the basis of purchase where allowancesfor variations in colour may be expressed moresimply in terms of colorimetric readings.

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In this investigation we can see the averagestore lighting in the main business street at secondand third cllss cities and also towns throughoutthis country.
And we are obliged to recognize the fact thatit is rather poor in intensity as well as in fixture, so, here we have a few suggestions to promotethem.
It will be our hearty thanks if lighting menmay take our suggestion for their activities.

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After several meetings the Committee on Vocabularyhas first decided the definitions for 22terms relating to illuminating engineering, andthey are shown in the following in English forthe sake of reporting to the InternationalCommission on Illumination.

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Symbols for photometric quantities, the definitionsof which have been adopted by the InternationalCommission on Illumination, are determinedas follows by the Committee on Vocabulary.

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