Elect.
an especially quiet switch that opens and closes an electric circuit by shifting a vial containing a pool of mercury so as to cover or uncover the contacts.
Elect.
an especially quiet switch that opens and closes an electric circuit by shifting a vial containing a pool of mercury so as to cover or uncover the contacts.
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012