Micrography metallurgy analysis. Researcher in the 1930s using a new photomicrograph design (right) to analyse the structural effect of corrosion on m
Micrography metallurgy analysis. Researcher in the 1930s using a new photomicrograph design (right) to analyse the structural effect of corrosion on metals (left) used in aircraft construction. The US researcher is Willard H. Mutohler, one of the designers of the new device. The new design increased the speed and efficiency of such research, making it possible to obtain as many as 700 micrographs per day, with film rolls of 900 negatives removing the need to insert and replace film. Previously, only 12 micrographs per day were possible. Photographed on 18 August 1937 at the National Bureau of Standards, Washington DC, USA.
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