Comprises a hollow wooden resonance box 120 x 12.5 x 10 cms (L x W x H.) Two
wooden rules 1 mtr. long subdivided in mms, between fixed bridges over which wires are stretched. A spring balance
100 x 5 N
is fitted on one wire. Tension exerted can thus be measured and also adjustable finely by a wing nut
resting against a plate
at the end of the apparatus, second wire passes over a pulley and can be loaded as desired, a
third wire is given for
comparison and its tension adjustable by a wrest pin.
The wires are made of rustless
steel having uniform density.
Distance between fixed bridges is kept 720 mm. Supplied complete with three movable
bridges, a set of four wires 1.5 mtr.
each. Supplied without weights.
