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Match the Fingers of your Hands
Published on 2009-04-20 01:38:00
Materials:Paper (preferably unruled)PencilTwo sheets of graph paper15-cm scaleBlue and Red colour crayons (any two different colours)With the palm up, draw an outline of each of your hands on a sheet of plain paper.Take the help of a friend, if necessary.Measure the length in millimetres of each finger from the base line to the top of thefinger. Record your readings as follows:On a graph sheet, mark 5 equal distances say 10 divisions on the x-axis for the fingerswith the thumb as number one. Mar
Make an Astrolabe and find Latitude
Published on 2009-04-20 01:30:00
Materials:Weight (small screw, nut, washer)StringProtractorPaperGlueCello tapeMagnetic compassTie a weight to one end of a length of string. Tie the other end to the centre of the baseof a protractor* directly under the 90°-mark.Invert the protractor. The weighted string should now cross the 90°-mark.Roll up a piece of paper to form a long narrow tube, and paste the flap with glue. Tape the tube to the base of the protractor. The Astrolabe is ready.Go out in the open at night. Find the appr
Make Electric Bell
Published on 2009-04-20 01:21:00
Materials:Thick cardboardHandsawSoft iron bolt* (8 cm long)Enamelled copper wireCello tapeOld tinShearsCorksSmall boltBob pinPlasticineHigh amperage dry cellTap keyGong (or small old tin without lid)Sand paperYou can easily make an electric bell that will ring with dry ceils. An electric bell issimply an extension of the electric buzzer . Both work on the same principle.We need;(a) Bigger base—Cut a board 22 cm x22 cm from thick cardboard.(b) Stronger electromagnet: Use a bolt electromagnet (1
