Abstract
THE explanation of a well known phenomenon in photography, given by Sir Oliver Lodge in his letter to you last week (p. 5), does not take into consideration the following facts:— (1) The “perceptible difference in thickness” between the acted-on and unacted-on portions of a negative is only perceptible to our unaided senses when certain developers are employed containing substances which act powerfully on the gelatin. Most modern negatives certainly have no perceptible difference in thickness, certainly not enough difference to give rise to so marked an effect as that referred to. (2) The difference in thickness is most marked in the “carbon” transparencies from which many enlarged negatives are made. Here it can be both seen and felt; in the other case it cannot. We might therefore expect this cylindrical lens effect to be most marked when using such a transparency, but the careful comparison of a number of enlarged negatives made in these two methods reveals not the slightest difference between them.
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BAYLEY, R. Border occasionally seen between Light and Dark Regions on Photographic Plates. Nature 73, 29 (1905). https://doi.org/10.1038/073029b0
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DOI: https://doi.org/10.1038/073029b0
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