Comprising a wooden sounding box
of 1020 x 115 x 60 mm with two rules 1 meter long
sub divided into millimeters. one each brass and steel wire of different
diameter attached to fixed bridge and tensioned by fine adjustment pegs two
movable bridges pulley and fixed screw to enable a third wire to be fixed
for tensioning by masses one each additional wire of steel and brass each
1.5 m x 0.71mm.