A three beam balance is a type of scale used for accurately measuring the weight of objects. The scale consists of a heavy base that balances a platform, called the pan, on one side and a counter weight system on the other side. The counter weight has three sliding weights that move along horizontal rulers, called beams. When an object is placed in the pan, the sliding weights are then moved until they balance against the weight of the object in the pan. The total of the weight measurements on each beam then reveals the weight of the object.
Step 1
Slide all of the counter weights to the end of the beam closest to the pan. Turn the adjustment knob on the counter weight to align the pointer on the scale with the zero mark on the base.
Step 2
Put the object you want to weigh in the center of the pan.
Step 3
Move the heaviest weight along its beam until it outweighs the object and tips the scale, then back the weight up one increment to tip the scale back toward the object.
Step 4
Move the middle weight along its beam until the balance tips, then move that weight back one step.
Step 5
Move the lightest weight along its beam until the pointer on the balance points to the zero mark on the base of the scale.
Step 6
Total the weights indicated on each of the three beams. This total value is the weight of the object.
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