Development of a new‐type instrument gauge which opens an entirely new aspect to the measurement of thickness of metal sheet stock has been announced by The Glenn L. Martin Co. The device also may be used for inspection of the bonds between the laminar layers of laminated materials.
(1946), "A New Thickness Measuring Gauge: An Ingenious Glenn Martin Device that Operates on the Pressure Principle", Aircraft Engineering and Aerospace Technology, Vol. 18 No. 6, pp. 214-214. https://doi.org/10.1108/eb031385
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