Triple Beam Balance

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A Triple Beam Balance is one of the most unique types of balance. It is a typical mechanical balance with three parallel beams after which it has been named. The instrument has a principal beam supported by a fulcrum. On one side of the instrument a pan is fixed on which objects are placed for weight measurement. On the other side, the beam is split into three parallel beams each supporting one weight. The three beams measure the weight in three different weight ranges.

In determining the weight of an object, rather than adding additional reference weights, each of the three weights can be slid along the beam to increase their lever arm. The mechanism is similar to a teeter-totter in which the heavier person sits closer to the fulcrum to decrease their lever arm.