. The principles and practice of roentgenological technique . to pass throughhead at angle of twenty-three degrees toline extending from external auditorymeatus to glabella. Fig. 216.—Law utihzes a 20 degree angular blockand place-, the tip of an angle finder oppositethe glabella, the left arm passing across the ex-ternal auditory meatu>. the right arm extendingalongside the cone and giving the direction ofthe central ray. This is the Caldwell angle between the two arms is 2}°^ 154 HEAD

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Keywords: ., bookcentury1900, bookdecade1920, booksubjectradiogr, bookyear1920