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- A free standing backboard provides supports for three tensile suspenders that meet at a ring carrying a load hanger. Spring balances measure the tension in each of the suspenders which are at about 30 and 45 degrees to the central vertical one. The lengths of each suspender can be adjusted by a threaded rod attached to the spring balance. A set of calibrated weights is supplied to apply loading to the wires. An instruction manual is supplied.
