Abstract
THE general character of this annual is so well preserved that it needs an actual comparison with the pre-war issues to discover that it is reduced to about half its normal size. Although the “Epitome of Progress ” for last year is somewhat curtailed, this is compensated for in great measure by condensing the abstracts and giving references. There has been so much talk with regard to rendering this country independent of foreign factories, so far as some of the more costly chemical preparations are concerned, that one naturally seeks for evidence of progress in this direction. It is satisfactory to note that the Ilford Company is now able to supply certain pure dyes prepared under the direction of Prof. W. J. Pope, of Cambridge University. It mentions a “considerable number” useful for the making of colour filters of all kinds, stains for microscopy, etc., and it is claimed that they are superior to the pre-war German products. Among the latest introductions are pinacyanol and pinaverdol, now called sensitol red and sensitol green respectively; sensitol violet, which is an entirely new panchromatic sensitiser; and filter yellow A. These, with metol and amidol (made by the firm of Johnson and Sons), and various metol substitutes, the compositions of which are not stated, show that a good deal has already been done. Perhaps the second most notable item is the rise in the price of photographic plates. Before the war the popular one shilling a dozen for quarter-plates was increased by 25 per cent., and now, by successive steps, the shilling has risen to two shillings and ninepence.
The British Journal Photographic Almanac and Photographer's Daily Companion, 1918.
George E.
Brown
Edited by. Fifty-seventh issue. Pp. 660. (London: Henry Greenwood and Co., Ltd.) Price 1s. 6d. net.
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The British Journal Photographic Almanac and Photographer's Daily Companion, 1918. Nature 101, 23 (1918). https://doi.org/10.1038/101023b0
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DOI: https://doi.org/10.1038/101023b0