Metal-work; a handbook for teachers and students (1914)
Adam, Hugh M. [from old catalog], Evans, James Humphrey, [from old catalog] joint author · New York, Longmans, Green and co.; London, E. Arnold · leaf 119
crew. They are suitable for larger work.2. The spring dividers (Fig. 47) are preferred for smallwork. The legs are joined by a spring which tends to throwthe points apart^ and adjustments are made by a screw andnut. Except in small sizes, alterations and readjustmentsare slower, but the greater… … Fig. 49.—Standard Sueface Plate: Under-side, Showing Ribs. to counteract any tendency to twist or warp. Fig. 49 showsa Whitworth surface plate, which gives the best arrangementof ribs. It will be observed that the plate rests upon threebearing points when in use, thereby giving a steady…
Metal-work
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