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 of the different parts, so c; the latter form the pivots… … overcoming obstructions than This improvement is also ap- if drawn with a full square plicable to windows which do not RUSSELL'S IMPROVEMENT Da HARROWS 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.…
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