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In the Journal of December 1896, I published a description of a "New Obstetric Forceps." In response to numerous requests for a detailed account of the axis-traction features of my forceps and under this stimulus, I have added to and recast what has already been published, making the description entirely a new one. A glance at Fig. 1 reveals the forceps with two circles described around it, having a common center, which is at the lock. A sector of the larger circle is formed by the blades and an arc of the same circle. Another is formed, by the handles and an arc of the smaller circle, or an equal one by the blades and an arc of the same circle passing through the blades, where they are farthest apart. Thus, as the blades are separated, the distances between them are accurately read off on the handle of the lower
SPÄCH AB. A NEW OBSTETRIC FORCEPS AND AN AXIS-TRACTION FORCEPS.. JAMA. 1897;XXIX(15):750. doi:10.1001/jama.1897.02440410035005a