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The instrument which is the subject of the following description was briefly described in the July (1896) number of the Cleveland Medical Gazette. It is now being quite extensively and, I regret to say, defectively manufactured. The italicized paragraph points to the defective features of many of the specula to be found at the shops. If this feature is not made to operate precisely as designed the instrument can not be manipulated with one hand unaided.
This two bladed speculum is designed especially for use on the rectum. The form and dimensions of the blades have been planned with a particular consideration for the dimensions and form of the parts upon which they are to be used. The blades proper are two inches (5 cm.) in length, they are very shallow and their edges are given a pronounced inward turn; their acorn-like initial extremity contributes to the instrument's facility for
MARTIN TC. A NEW RECTAL SPECULUM.. JAMA. 1898;XXX(13):742-743. doi:10.1001/jama.1898.72440650038012