bids are invited for screw jack apparatus with weights screw jack ( without weights ) all metallic construction accurately machine cut screw with a pitch of 5 mm carrying a double fanged turn table of about 20 cm diameter. fitted on a heavy cast iron base and complete with two adjustable pulleys, cord and hooks. with weight instruction manual consisting of experimental procedures & block diagram should be provided along with the tender. calibration certificates must be attached along with technical bid. 2 02 worm and worm wheel :: single with weights an all metallic self-contained apparatus useful for demonstrating the efficiency for worm and wheel and also the principle of work. consisting of a machine cut worm gear of 25 cm diameter, carrying a meta l 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 wall. complete with effort pulley, string and hooks with weights. instruction manual consisting of experimental procedures & block diagram should be provided along with the tender. calibration certificates must be attached along with technical bid. 2 03 worm and worm wheel :: double with weights an all metallic self contained apparatus useful for demonstrating the efficiency of worm and wheel and also the principle of works. consisting of machine cut worm gear of 25 cm diameter, carrying a metal drum on 12 cm diameter, and machine cut worm on steel spindle carrying a 12 cm diameter pulley. double weight instruction manual consisting of experimental procedures & block diagram should be provided along with the tender. calibration certificates must be attached along with technical bid. 2 04 worm and worm wheel :: triple with weights an all metallic self-contained apparatus useful for demonstrating the efficiency of worm and wheel and also the principle of work, consisting of machine cut worm gear of 25cm diameter carrying a metal drum of 12 cm diameter pulley. the whole arrangement is fixed on heavy cast iron bracket capable to be fixed toa wall. complete with effort pulley , string and hooks with triple weight. instruction manual consisting of experimental procedures & block diagram should be provided along with the tender. calibration certificates must be attached along with technical bid. 2 05 wheel and differential axle 30 cm with weight the axle having dia of 15 & 7.5 cm respectively giving a ratio of 1:2:4. centre of the wheel which is mounted on ball bearing in cast iron brackets reducing friction to minimum. complete with snatch pulley block, cord & hooks but with weights. instruction manual consisting of experimental procedures & block diagram should be provided along with the tender. calibration certificates must be attached along with technical bid. 2 06 winch crab single purchase with weight 2 fitted with heavy cast iron wall brackets. the grooved wheel is of 25 cm diameter and gears are machine cut. this apparatus is used for experiments in efficiency of mechanical advantage weights are included. instruction manual consisting of experimental procedures & block diagram should be provided along with the tender. calibration certificates must be attached along with technical bid.