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8. The breadth of the inner slips is one quarter of a hole; their thickness one sixth. The coverjoint or lid of the chelonium is dovetailed into the shafts of the ladder, and is three sixteenths of a hole in breadth and one twelfth in thickness. The thickness of the square piece on the ladder is three sixteenths of a hole, . . . the diameter of the round axle will be equal to that of the claw, but at the pivots seven sixteenths of a hole.
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