Measuring equipment for Prof C.V. Boy's radiomicrometer, by Cambridge Scientific Instrument Co. , Cambridge, England, 1889-1893. Prof C.V. Boy's radiomicrometer 1889-1893
Measuring equipment for Prof C.V. Boy's radiomicrometer, by Cambridge Scientific Instrument Co. , Cambridge, England, 1889-1893. Prof C.V. Boy's radiomicrometer 1889-1893
Prof C.V. Boy's radiomicrometer, made by The Cambridge Scientific Instrument Company, Cambridge 1889-1893. Prof C.V. Boy's radiomicrometer 1889-1893
Prof C.V. Boy's radiomicrometer, by Cambridge Scientific Instrument Co. , Cambridge, England, 1889-1893. Prof C.V. Boy's radiomicrometer 1889-1893