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Spring-proof.

The strength and temper of springs is tested by suspending from them a weight or causing them to be subjected to a strain equivalent to a certain weight adapted to their capacity.

The main-spring of United States small-arms is proved (1) by a weight of 70 to 75 pounds, which should cause the spring to bend to a given mark without breaking or setting; (2) by being required to stand at the position of full cock for 12 hours in a spring-proof containing 35 main-springs.

The sear-spring is required to sustain a strain of about 20 pounds.

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