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12Beams of considerable length must be procured, upon which are fixed cheeks in which the axles are retained; in the middle of those beams holes are made, into which are received the capitals of the catapultæ, well tightened with wedges, so that the strain will not move them. Then brazen stocks are fixed for the reception of the capitals, in which are the small iron pins which the Greeks call ἐπισχίδες.
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