Extension Call-bell. A bell connected with a telephone call-bell, and located in another part of a building so as to give a distant summons.
External Circuit. (See [Circuit, External].)
F
F. The sign commonly employed to designate Fahrenheit. Thus, 30° F. means 30 degrees Fahrenheit, or 30 degrees above zero.
False Magnetic Poles. (See [Magnetic Poles, False].)
Faradic. Induced current produced from induction-coils and faradic machines.
A series of alternating electrostatic discharges, as from a Holtz influence machine.
Faradic Coil. (See [Coil, Faradic].)
Faradic Currents. (See [Currents, Faradic].)
Faradic Machine. An apparatus designed to produce faradic current.