This paper gives a brief account of the development, during the war emergency, of equipment made especially for the measurement of vibration and strain in airplane structures in flight. Experience in the design and manufacture of seismograph equipment made rapid development possible. A mass spectrometer is also described. This instrument was built originally for analysis of gas samples in connection with geochemical prospecting, was then adapted for rapid analysis of complex hydrocarbon mixtures and has found application particularly in control of refinery processes.

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