Standard ratio for use in bridge measurement
Phase II Standard Ratio for use in bridge measurement, made by H. Tinsley & Co., London (UK), no. 14554. Part of the equipment used by the Metrology Department at UMIST.
Phase II Standard Ratio for use in bridge measurement, made by H. Tinsley & Co., London (UK), no. 14554. Part of the equipment used by the Metrology Department at UMIST.
