A small steel instrument with two prongs, which when struck sounds a certain fixed tone in perfect pitch: it is used as a guide in tuning instruments, in testing hearing, etc.
Webster's New World
Other Word Forms of Tuning-fork
Tuning-fork Sentence Examples
On the same band a tuning-fork electrically maintained and a seconds clock actuating another style wrote parallel records.
The time between the breaks could be measured in seconds by the clock signals, and in fractions of a second by the tuning-fork record.
If, at the same time, a tuning-fork of known number of vibrations per second be made to trace its own line close to the other, a comparison of the two lines gives the number corresponding to the sound under consideration.
The motion of the fork is maintained by the clock acting through an escapement, and the dial registers both the number Koenig's of vibrations of the fork and the seconds, minutes and Tuning-fork hours.
We may illustrate the successive modes of vibration by using as pipe a tall cylindrical jar, and as exciter a vibrating tuning-fork held over the mouth.