Greenhouse Construction : a Complete Manual On the Building, Heating, Ventilating And Arrangement of Greenhouses, And the Construction of Hotbeds, Frames And Plant Pits
The book Greenhouse Construction : a Complete Manual On the Building, Heating, Ventilating And Arrangement of Greenhouses, And the Construction of Hotbeds, Frames And Plant Pits was written by author Taft, L. R. (Levi Rawson), B. 1859 Here you can read free online of Greenhouse Construction : a Complete Manual On the Building, Heating, Ventilating And Arrangement of Greenhouses, And the Construction of Hotbeds, Frames And Plant Pits book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Greenhouse Construction : a Complete Manual On the Building, Heating, Ventilating And Arrangement of Greenhouses, And the Construction of Hotbeds, Frames And Plant Pits a good or bad book?
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Carmody, the inventor. It has much the shape of a meat saw (Fig. 44), and lifts the sash by the action of the cogs on the shafting, upon those on the fixture. It works easily, and the same force is required to lift the sash, at whatever height it may be. A form quite similar to this is used with the Little Victor machine, and is recommended by the inventor, E. P. Hippard, as valuable for small sash. Various contrivances have been ar- ranged, by which the weight of the ven- tilators, in closing,... shall coil nj) a spring, which, when it is desired to open tlie sash, will furnish a large por- tion of the power. One of the best of these is known as the Ormsby Spring balance. It has proven quite satisfac- tory, and Avorks very smoothly, opening, with the exj^enditure of very little power, a long line of sash. It is easy to put up, and the only objection to the system is that, after two or three years of use, the springs wear out. Of the machines used to work the shafting, with its elbow fixtures, the simplest is the kind generally used by greenhouse builders.
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