After you make
an inclinometer, you can use it to measure how high something is.




An inclinometer 

Something tall
to measure 

Pencil or pen 

Paper 

A tape measure
or yard stick to measure distance in centimeters 

A copy of the
Height Calculator Grid 


Look through the end of the tube that sticks out from the card. You can
look through the tube or sight along the top of the tube. It’s your
choice.
Look at something
that’s at eye level. Ask a friend to read the angle where the string
crosses the protractor. If your inclinometer is level, the string should
cross the protractor at about 0 degrees.
Look
through the tube at the top of something tall. If you are indoors, look
at something that’s near the ceiling. Ask your friend to read the
angle where the string crosses the protractor.
When you look at something
above your head, the inclinometer tilts. The string crossing the protractor
marks the angle of the tilt of the inclinometer. Take a few steps toward
the tall thing and check the angle on your inclinometer again. What happens
to the angle on your inclinometer?
Rather than
having your friend read the angle for you, look through the tube and pinch
the string against the card to hold it in place. Then take the tube away
from your eye and read the angle on the protractor. Have your friend watch
you do this and tell you if you move the string and change the angle.
Try this a few times, until you can do it without changing the angle.
Choose something tall to measure.
Look at the top of the object through your inclinometer and determine
what angle your inclinometer measures. Write down this angle.
Measure how far it is (in centimeters) from where you are standing to
the base of the object. Write down this distance.
Have a friend measure how far it is from the floor to your eye level.
Write down this distance.
Follow the instructions on the Height Calculator
Grid.
Height
Calculator Grid
For tips on
how to use this trick with a class or group, go to the Teacher/Leader
version. 