the back of each weight is wheel on avertical shaft®provided atits lower end with a channel to receive lead or other heavy materi to folded and placedin position for use. A pair of tra- a hand wheel., To each pinion is secured a cord, which suit the weight to that of the window. The side pezoidal… … trated lecture on Friday evening, by Prof. C. A. Ash- PAINE’S DEVICE FOR OPENING WINDOW SASHES. burner, of Pennsylvania, on ‘‘The Geology of Oil and verse motion to the weights, which thus balance the Gas.” Special preparations have been made by the ient reach, so that, by drawing any one of the…
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