Abstract
THE sixtieth issue of this welcome annual appears only a week or two later than in pre-war time, and the edition is increased from 25,000 to 30,000. This indicates a gradual progress towards normal conditions. On the other hand, the volume is about seventy pages fewer than last year, and the price is increased. The obvious reticence of advertisers with regard to quoting prices, which we remarked on a year ago, still impresses one, though perhaps less strongly. The editor contributes a lengthy article on general photographic procedure which cannot fail to be of assistance to beginners. The usual “Epitome of Progress” is an excellent summary, extending to nearly 100 pages, of the notable events, business items, legal matters, novelties in apparatus and equipment (including raw materials used in photography), and new methods or modifications of them. After the extensive collection of formulae follows “A History in Brief of Photographic and Photomechanical Processes,” giving the year and sometimes the month and day of the chief events, beginning with Thomas Wedgwood's experiments, published by Davy in 1802. Of the other new matter, we are particularly glad to see that the editor has given a table which he calls “Corresponding Focal Powers and Focal Lengths.” The focal powers are given in diopters, and the corresponding focal lengths in centimetres and in inches. Many lens problems are so very much more simple when calculated in diopters instead of in focal lengths that we hope this table will be extended in next year's issue, and that there will be added to it a few simple instructions as to its use.
The British Journal Photographic Almanac and Photographer's Daily Companion, 1921.
George E.
Brown
Edited by. Pp. 840. (London: Henry Greenwood and Co., Ltd., n.d.) Price 2s. net.
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J., C. The British Journal Photographic Almanac and Photographer's Daily Companion, 1921 . Nature 106, 692 (1921). https://doi.org/10.1038/106692a0
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DOI: https://doi.org/10.1038/106692a0