A beam having a 5:1 ratio and
pivoted to move in a horizontal plane is mounted on a metal baseplate fitted
with feet. 100mm of a wire is held between one clamp at one end of the beam
another clamp fixed to a tensioning screw. The beam attached to a spring
balance 0 to 30 x 1N which connected to a second tensioning screw.Overall
dimensions 335 x 290 x 42mm. scale printed 0 to 100 x 2mm on base plate.