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some experiments, 3
 

image

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By suppression of the colours. —
In this, the axis of principal stress in the standard, instead of being parallel to that of the specimen, is placed at right angles to the same (see coloured plate, Fig. 16… This method has the great advantage of eliminating errors in the matching of colours, always a difficult task, especially when other colours of nearly the same shade are in close proximity. (pp 65)

Fig. 16, H. E. Lance Martin, Some experiments with reinforced materials examined by aid of plane polarised light. Transactions, Liverpool Engineering Society 36 (1915): 59-78 (discussion and correspondence continues through p98)
 

5 November 2012
tags: colour; polarised light; Martin, H. E. Lance; stress; colours, suppression of; transactions