ten little fingers - arvind gupta (4 mb pdf)

GO - NO GO MATCHBOX1. Take a cardboard matchboxdrawer and cut two V notches inthe middle of its two long edges.Make a clear hole in the centre ofboth ends of the drawer.2. Cut an old ball pen refill equal insize to the width of the drawer.3. Fix the refill in the Vnotches of the drawer with adab of glue.4. Weave a 70-cm. long stringthrough the two holes of the drawer.The thread should go over the refill.Tie two pieces of folded paper at thetwo ends for a good grip5. Cover the drawer with theouter shell of the matchbox.TURNING TURBINE6. Hold the two endsof the string up- right.If the string is keptloose then the matchboxslides down. Butif you tighten thestring it rubs againstthe refill and brakesthe matchbox to astop. This obedientmatch- box is basedon the principle offriction and gravity.1 Take the plastic lid ofa Paan Masala tin.2. Mark out six equally spacedlines on its rim. Cut these linesand about 1-cm of the rim.3. Offset the cut portions to makethe blades of the turbine. Make ahole in the centre of the lid andpress fit a 2-cm long piece of usedball pen refill in it.4. Put a long needle inside therefill bush to complete the turbine.5. Hold the turbineunder a stream ofwater and see it spin.