| 摘要 |
An improved versatile measuring device for measuring linear, and angular dimensions and defining relative positional parameters or coordinates between a plurality of lines, points, or surfaces on a plane and for determining and duplicating line lengths and relative angular positions of any number of lines, points or surfaces. The measuring device has protractor members each of which is rotatably and clampably attached to a connecting member which itself is linearly extendible and may also be altered to have a pivoting point about which a main arm and an extendible arm of the connecting member are pivotal and clampable with respect to each other. Each of the protractor ends also has an edge-guide slot substantially parallel to a scribe edge. Slideably mountable onto each of the edge-guide slots is at least one edge-guide pin each of which is positionally adjustable and securable within an edge-guide slot. The pins provide an edge reference useful for the repeated and consistent layout and marking of an article such as stair stringers or roof rafters which are being prepared for use.
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