Set of 8 tuning fork of nickel plated steel with plain or screwed shank in case, frequencies marked from (C1 256) to (C2 512) as above.

Two Tuning forks are mounted on two wooden resonance boxes dimensions of which are compatible with frequency of the forks to produce a strong sustained tone. Forks are nickel plated with shanks to screw in the bushes on the top of the boxes. Each set supplied with rubber headed hammer.

Four tuning forks are mounted on a single proper sized resonance box to produce a major chord. Forks have frequencies of C1 256, E 320 Hz, G 384 Hz and C2 512 Hz. When struck together with hammer, the forks will produce the chord of C major. Supplied complete with one hammer.

It comprises two tuning forks each of frequency 426 Hz on two separate resonance boxes. One fork is fitted with adjustable loading mass. When both forks are sounded together, a clearly audible beat is produced. Rate of beats depends on difference in frequencies. This difference can be increased by changing the loading mass.

A rubber ring mounted on a metal disc with steel rod and wooden handle.

With rubber sheet affixed on both ends