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N a compass for drawing, in which the legs are joined by a flexible metal bow-shaped spring rather than a hinge, the angle being adjusted by a screw 弹簧圆规 (Also called bow-spring compass)
calliper , divider
According to the compass screwed onto the bow, Max was sailing directly for it, due north-northwest, and yet the city lights were growing fainter.
NEWYORKER: Max at Sea
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