| 摘要 |
The T-square apparatus comprises a triangular frame (14) having three flat working surfaces (17,18,A) oriented at select angles to each other. Three level vials (53,54,55) are included and mounted on the frame, so that one level vial is in parallel relation to each working surface. A measuring blade (36) is also incorporated. An L-shapted angle bar (68) has two flat walls normal to each other. The angle bar is fixed attached to one end of the measuring blade so the plane of the measuring blade is normal to the planes of the two walls. A device slidably mounts the measuring blade on the frame in parallel relation to one of the working surfaces.
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