Making an Air-Screw
You will need: Stiff drawing paper or thin card,
ruler, pencil, scissors, compass, cork, needle.
Warm air always rises. With
a constant source of heat, we can use a current of warm air to turn a miniature
turbine or 'air-screw.'
Take the drawing paper or
card, set the compass to 2 inches and draw a circle on it. Reset the compass to
half an inch and draw a smaller circle inside the larger.
Carefully cut around the
larger circle and then rule 16 or 18 lines across the paper disc, in the manner
shown in the diagram.
Cut along these radiating lines but stop each
cut at the edge of the inner circle.
To create the turbine-wheel
you must give each blade a slight twist, each in the same direction. When the
blades have been carefully set in this fashion, insert the blunt end of a
needle into the end of a cork and balance the 'air-screw' on the point of the
needle.
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