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Irwin E. Siris, M.D.
JAMA. 1922;79(24):1999. doi:10.1001/jama.1922.26420240004013d.
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The adjustable fixation calipers with immobilized prongs, illustrated at A, are made of hand forged steel. The lower arms possess a full curve, being readily adjustable to complete closure. The points are very sharp and taper for 1 inch (2.5 cm.) from the shoulder. A thumb set screw is attached to the center of one handle and passes through an opening in a horizontal cross-bar. The grasping portion of the thumb set screw is 1 inch wide and one-half inch (1.3 cm.) long, and is peened on its under surface to prevent its becoming detached and lost. The cross-bar, one-half inch wide, is riveted to the center of the opposite handle and is fenestrated two fifths of its length for the opening and closing of the calipers. For one-half inch on each side of the thumb set screw, the handle is serrated, to facilitate closure. In the application of the


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