Tuning Fork Hammer

On sturdy streamlined base with provision for horizontal or vertical use. Forks is manufactured from selected steel. Prong is 10 x 25 x 300 mm. accurate frequency adjustment, chrome plated, vibrations rate 60 per seconds. Electromagnet can work on 6 volts. The amplitude of vibration can vary by sliding there electromagnet inside prongs. Complete with bench clamp, pulley, and scale pan.

Comprising a hollow wooden resonance box, with two meter rules graduated in millimetres, mounted on top on either side along the length.

One each of brass and steel wires of different diameter attached to fixed bridge on one end of the box and tensioned by wrest pins at the other end.
A pulley mounted at the end supports third wire over it with masses suspended to the wire end. Includes two short and two long bridges for adjusting length of vibrating strings, and additional wires one each of steel and brass of 22SWG.