How to Make a Simple Theodolite

Step-by-Step Guide

1. 1

   Step 1: Cut a 15 cm x 15 cm (6 inch x 6 inch) square out of the cardboard.

   You'll only need one of the pieces. , If your straw has a bendy part, cut it off. ,, Make sure it hangs straight down. ,,, It doesn't matter if you don't have the top of the object in sight; we'll get to that later on., This means you have to hold the theodolite perfectly horizontally., The string with the screw must hang straight down; it mustn't dangle backwards, forwards or sideways. ,,, For example, if you are
   1.75m tall, and the distance from your marked position to the base of the object is 7m , then the object is
   8.75m tall.
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   Step 2: Cut the square in half along one of the diagonals

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   Step 3: creating two right-angles triangles.

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   Step 4: Tape the straw to the diagonal side of the triangle.

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   Step 5: Tie a screw or bolt to the 25 cm (10 inch) piece of string.

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   Step 6: Tape the string to the top of one of the straight sides.

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   Step 7: Finished.

8. 8

   Step 8: Find a tall object to measure.

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   Step 9: Look through the straw in the direction of the object.

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    Step 10: Ensure that the string with the screw hangs perfectly straight down at all times.

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    Step 11: Walk backwards or forwards until the top of the object can be seen through the straw.

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    Step 12: Mark your position on the ground.

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    Step 13: Measure the distance from the base of the object to your marked position.

14. 14

    Step 14: Add the measured distance to your own height.

Detailed Guide

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