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Points from Foregoing Letters

Nature volume 139, page 376 (27 February 1937) | Download Citation



THE presence of traces of calcium, copper and zinc affects considerably the properties of surface films, and Dr. R. J. Myers and Prof. W. D. Harkins consider that the results of many previous experiments reported in the literature (apart from those carried out in strongly acid solutions) are likely to have been vitiated by such contamination. They advise future investigators to use quartz or very heavily paraffined glass troughs, and to make sure that all salts are exceedingly pure.

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