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1.1

Minor Versionm

by Procheta Mallik

Introduction

Using simple materials like cradboard, pencil, some pins and a straw, we construct models of an anemometer and a wind vane

    • Use the scissors with caution.

    • Be careful with the push pin - the sharp point may break skin.

    • Be cautious with the stapler.

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    • ANEMOMETER

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    • Place the cardboard pieces as shown in the picture, like a cross

    • Staple them together thus

    • The blue tapes on the cardboard pieces are to stabilise any bends in the cardboard.

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    • Cut 4 circles on the A4 sheets of paper.

    • The radius of the circles will be equal to the height of the cone we want to make.

    • Cut along the dotted lines as shown after making the circle.

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    • After cutting out the little piece in the circle, follow the arrows in the picture to make a cone.

    • Once the cone takes shape, hold it together with tape.

    • Keep following the direction of the arrow (by placing one side of the paper on the other), until you can see a cone.

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    • Attach one cone to one end of the cardboard cross with the help of a stapler.

    • All the cones need to be below the cardboard pieces and should be facing the same rotational direction, as shown.

    • The direction of the cones must be followed as this will allow free motion in the wind.

    • You can also use tape to attach the cones to the cardboard instead of staple pins.

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    • Place the pencil rubber side up, at the intersection of the cardboard pieces on the lower side.

    • Then pierce an all pin (push pin) through the same intersection from the top.

    • The push pin will now go through the rubber part of the pencil, making a stand.

    • You can pierce the pin first and then push the pencil rubber through it if it makes it easier.

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    • Now take this anemometer into a windy place, and use it to test the speed of the wind!

    • Count the number of rotations the anemometer takes every 10 seconds!

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    • WIND VANE

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    • Draw the figures as shown and cut out the pieces using scissors.

    • The figures are approximately 5cm (2 inches) long.

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    • Make slits at the ends of the straw, as shown, on both sides.

    • Insert the cutout figures into the slits, one on each side.

    • Push the figure in until it sits snugly.

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    • After attaching the figures, push a bobby pin into the middle of the straw as shown.

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    • Cut out a circle with directions - North, South, East and West

    • Place the pencil on top of it and test it.

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    • Take this wind vane out into the garden and determine the direction of the wind blowing!

    • First make sure you place your direction circle in the correct orientation!

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    • If the pin keeps falling off the pencil, just push it into another point in the eraser and make sure the hole is not too big.

    • If the cones are not aligned properly, remove them and stick them again.

    • If cones are not working as well as you'd like, you can replace them with paper cups!

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    • What happens to the anemometer when you take it to a windy place?

    • What happens when you place it directly in front of the fan?

    • If you attached weights to the cones, what would happen?

    • Is there a difference if you use plastic cups instead of cones?

    • Do you think this would be a useful device to be warned about extreme conditions? (like at offshore places)

    • What is the use of the wind vane?

    • Does the wind vane keep changing direction?

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Finish Line

Suchitha Vishwa

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