- A device that converts sound into an electrical signal - Chopin more confused by voice projector - Device used when addressing a crowd - An instrument for intensifying and making audible very
feeble sounds. It produces its effects by the changes of intensity in
an electric current, occasioned by the variations in the contact
resistance of conducting bodies, especially of imperfect conductors,
under the action of acoustic vibrations.
- One who, or that which, connects - A flexible tube for connecting the ends of glass tubes
in pneumatic experiments. - A device for holding two parts of an electrical
conductor in contact.
- One who, or that which, interrupts. - A device for opening and closing an electrical
circuit; a vibrating spring or tuning fork, arranged to make and break
a circuit at rapidly recurring intervals, by the action of the current
itself.