| 摘要 |
This specification discloses an instrument intended for field use in marking pipe insulation for the cutting of miters so that the insulation may be applied to a pipe elbow. The instrument comprises an elongate strip having a working face and flanges at one edge normal to the strip and extending in opposite directions from the strip. A straight edge is pivoted adjacent to one end to the strip and over the working face. The latter displays two sets of indicia. One of these is an angular index which indicates the angle which the straight edge is to assume with respect to an edge of the strip for a particular range of pipe sizes and the other is a lineal index which indicates where a second cut is to be made in relation to a first cut as determined by pipe size.
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