| 摘要 |
The disclosed measuring instrument includes a pair of members arranged together to form a right-angled L and the members having indicia providing linear scales useful in measuring areas in architectural plans and the like. The members are separable at the joint that forms the corner of the L and are further capable of re-connection to each other in end-to-end relationship so as to provide an elongated straight edge. The junction of the members at the corner of the L includes a pivot about which one member may be moved through a 180 DEG range to form an inverted L. In a modification, at least one of the members includes a wing element along one edge and rockable about a separable pivot on an axis parallel to that one edge.
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