. Teacher's handbook of Slöjd . Fig. 25. Trammel Heads, or Beam Trammels, hb, Fig. 26. Caliper Compasses. ^.turned away from one another (Fig. 26). 2. The Caliper Compass is used to measure thethickness of round or ovalobjects. This compass hasvery strong curved armswith points which taperobliquely. The ordinarycaliper compass may beused to measure the dia-meter of a hole, by turn-ing the arms round thehinge until the points are V. Squares and Bevels, Squares are used for testing right angles, bevels for testingangles of various sizes. TOOLS. 75

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