Description :-
On sturdy base, can be used in horizontal or vertical position. Prong size is 300 x 25 x 10 mm. Actuated by an electromagnet between the prongs, works with 6 V D.C. Amplitude of vibration can be varied by adjusting the position of the electromagnet.
Description :-
Sliding weights on each prong of tuning fork can be adjusted to deliver tones at C-128, D-144, E-160, F-170.7, G-192, A-213.3 and B-240 frequencies.
Description :-
Wooden baseboard 690 x 90 mm on four feet.
At one end are two 50 N spring balances with hooks and at the other are two wrest-pins.
With one large and two small bridges, wrest pin key and 2 steel wires, each 1 meter long, without masses.
Description :-
The high quality tuning fork set covers the octave from middle to high C.
It consists of one each of 261.6C, 293.7D, 329.6E, 349.2F, 392G, 440A, 493.9B and 523.2.
Set of eight with Activator.
Description :-
Hollow wooden sounding box 1290 x 130 x 110 mm, with mm scale, has two fixed bridges 72 cm apart over which wires are stretched.
To one wire is fitted a spring balance reading to 100 N x 5 N and its tension can be adjusted by a winged nut and measured.
Another wire passes over a pulley and can be loaded as desired.
A third wire, for comparison, can have its tension adjusted by a wrest-pin.
With 3 movable bridges, wrest-pin key, spring balance, and set of four wires of different diameters, each 1.5 meter long, without masses.
Description :-
Set of eight copper pipes with tuning fork (256 Hz) to show how resonance tones can only be created from certain pipes.
O-rings are attached to the ends of the pipes which protects the tubes from the drop In.
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