Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. From this idea came that of the rationality of considering a convergent form as a funda mental element in the calculation of the photo graphic energy of light and lighted surfaces and from these considerations the present system has resulted. A desirable name for this cone unit has been difficult to decide upon and the author invites suggestions in naming it.
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ISBN-13
978-0-243-75609-4 (9780243756094)
Schweitzer Klassifikation
