Patent for a new and improved sash lock. This design, "by means of a series of bolt-holes in both the upper sash and the frame the sashes can be held open for ventilation or securely locked in a closed position, as found desirable, and by means of the mortised seats and overhanging shoulders at the extremities of the slots, both the bolts can be drawn entirely within the casing and securely held in such position to enable both sashes to be raised or lowered at pleasure, and in the ordinary manner" (lines 75-84).