. The American journal of roentgenology, radium therapy and nuclear medicine . ^ willbe at the center of a sphere, a meridian arcof which is carried by the compass. This arc is capable of adjustment in any positionabout a central axis. An indicating rodpasses through a sHder attached to themovable arc in such a way as to coincide in. Fig. q. Hirtz Compass. all positions with a radius of the sphere,and whether it actually reaches the centeror not it is always directed toward thatpoint. If its movement to the center of thesphere is obstructed by the body of the pa-tient, the amount it lacks of r
. The American journal of roentgenology, radium therapy and nuclear medicine . ^ willbe at the center of a sphere, a meridian arcof which is carried by the compass. This arc is capable of adjustment in any positionabout a central axis. An indicating rodpasses through a sHder attached to themovable arc in such a way as to coincide in. Fig. q. Hirtz Compass. all positions with a radius of the sphere,and whether it actually reaches the centeror not it is always directed toward thatpoint. If its movement to the center of thesphere is obstructed by the body of the pa-tient, the amount it lacks of reaching thecenter will be the depth of the projectile inthe direction indicated by the pointer. The value of the compass lies in its widepossibility as a surgical guide, in that itdoes not confine the attention of the sur-geon to a single point marked on the skin,with a possible uncertainty as to the direc-tion in which he should proceed in orderto reach the projectile, but gives him a widelatitude of approach and explicit informa-tion as to depth in a direction of his ownselection. The compass is shown in Fig. 9 andschematically in Fig. 10. Three metal armsrespectively labeled 1,2, and 3 in clockwiserotation are so mounted as to turn freely Localization of Foreign Bodies upon a central pivot and have their uppersurfaces all
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Keywords: ., bookcentury1900, bookdecade1900, bookidamericanjour, bookyear1906
