Electrical horology; a practical manual on the application of the principles and practice of electricity to horological instruments and machines for the measurement and transmission of time, with an account of the earliest electrical-driven clock mechanism, by H. R. Langman ... and A. Ball. (Technical press manuals)
Electrical horology; a practical manual on the application of the principles and practice of electricity to horological instruments and machines for the measurement and transmission of time, with an account of the earliest electrical-driven clock mechanism, by H. R. Langman ... and A. Ball.