Worm and Worm Wheel

Worm And Worm Wheel An all metallic self contained apparatus useful for demonstrating the efficiency of worm and wheel and also the principal of work. Consisting of a machine cut worm gear of 25 cm diameter, carrying a metal drum of 12 cm diameter, and machine cut worm on steel spindle carrying a 12 cm diameter pulley. The whole arrangement is fixed on heavy cast iron bracket capable to be fixed to a wall. Complete with effort pulley, string and hooks but without weights. A) Single Purchase b) Double Purchase c) Tripple Purchase