Objective:

During this lesson you will be collecting data on 4 different trees.
The data that you will be collecting is as follows: 

The name of the tree, the height of the tree (using a clinometer),
circumference of the tree (using a measuring tape)

Directions:

1. Choose a tree to measure, write down the lay name of the tree and the latin name.

2. Using a trundle wheel to measure 15 meters away from the base of the tree.

3. At the 15 meter distance, squatting or laying down on the ground, sight the top of the tree using the clinometer.     Read the angle measurement found on the clinometer while sighting (sometimes called "shooting") the top of the tree.  Take the measurement at least 3 times to ensure accuracy.

4. Write down the average number for those angular readings.

5. Now using your angle conversion sheet, look the angle and find out what the height in meters would be for that angle. 

6. Now using your measuring tape, determine the circumference of the tree in centimeters and write this number on your data sheet.
 

This instrument is also called an astrolabe and can be used to compare the distances between stars, since the distance increases as the angle increases.