1, Application: The tuning-fork model 256Hz is a basic sonic instrument which performs sound occurrence and interference. It can be used to measure the sonic speed and check the traveling sound as well as carry out various other sonic experiments.

2, Performance and Specification: This instrument is composed of a single tuning-fork made of No.45carbon steel, a round handle, a resonant box and a rubber beater. It is coated with chromium, the four faces are even and straight and the edge angles are regular. The total length is 200.5mm. The tuning-forkprong size is 5.5*8.5mm. Its frequency is 256 cycles, with the tolerance ±0.4 indicated by the stamp.

3.Usage: Plus the fork into the socket on resonant box, then beat the forkprong with the beater of other elastic matter, the sound wave with the frequency 256cycles/second can be produced. Neither beat of the fork with hand matter, nor beat it at the desk. If so, a great deal of subwave would be produced. After usage, the tuning-fork should be wipedclearly with a piece of soft cloth, smeared with the rust-proof oil all over and stored in a dry place in order to avoidrust.