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Published in:
1971 | OriginalPaper | Chapter
The Photometric Measuring-units System
Author : H. A. E. Keitz
Published in: Light Calculations and Measurements
Publisher: Macmillan Education UK
Included in: Professional Book Archive
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In chapter I we said that when we had dealt with the photometric system and all that this embodies, we should see in how far the definitions of the conceptions and units employed in illuminating engineering would have to be extended in scope to include coloured light, and that, until then, the reader should regard the considerations dealt with as referring to white light only.