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Unequal Arm Bismar Steelyard Balance Scales
2 balances plus cup as pictured. Not complete as weights missing
Steelyards are lever balances with unequal beam arms and an immovable axis (fulcrum).
A hook or pan is attached to the shorter arm for holding the load. Another hook attached to a second fulcrum is used for holding or hanging the steelyard. Weighing the load requires that a counterpoise weight is moved along the long arm. At the place where the counterpoise keeps the beam exactly horizontal, the weight of the object is indicated on an engraved scale on the long arm. The advantage of this type of scale is that only one weight is used for a wide range of loads. To increase the range of weights that a steelyard can weigh, a modification was introduced in which a third fulcrum with hanging hook was added to the beam. This modification changes the ratio of length between the short and long arms of the beam and requires a different weight-scale to be engraved on the beam. Another modification exists in which a second counterweight is placed on the shorter arm, allowing deducting the empty container weight (tare6 weight) from the load, to obtain net weight. The steelyard was very common in medical clinics for weighing humans, in warehouses for weighing large loads, and also in large bridge scales for weighing trucks and trains
They have one pan suspended from an unequal arm, and a weight for counterbalance. A load is put on the pan and then the weight is moved along the arm until the scale is balanced.

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  • Seller location: Wellington City, Wellington, NZ

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