strips B B, at each side, are hollow screws or required, and the retaining of the sash at any point—up 1860. The value of the improvement consists in the or down—in proper position. All these desirable quali- stationary nuts, d, adapted for receiving the solid screws, construction and arrangement… … overcoming obstructions than This improvement is aleo ap- if drawn with a full square plicable to windows which do not IMPROVEMENT In front. <A shield of metal is usu- have balance cords and pulleys. ally secured to one of the harrows, and bent over in| accompanying engravings, Fig. 1 being a front…
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