The mercury changeover switch was operated by a special electromechanical relay. Each of its two ... For lack of a circuit diagram (or additional explanations) it is not immediately clear how the magnet serving the originally switched-off cable was energized.] FIGURE 63. P. A. Kovaleva#39;s automatic changeover switch. In the.
|Title||:||History of Automation in Russia Before 1917|
|Author||:||A. V. Khramoĭ|