A practical treatise on the construction, heating and ventilation of hot-houses; : including conservatories, green-houses, graperies and other kinds of horticultural . o c^ Fig. 53. Fig. * Wyman on Vent. 278 METHODS OF VENTILATION. whole house may be aired in the space of one minute; or asmany houses as may be in the range. This is eflected by a rodpassing along the whole length of the house. A pulley is fixedimmediately above each ventilator, and another placed oppositeit upon the rod, as shown in Fig. 51. A piece of chain or cordis attached to the ventilator at one end; an
A practical treatise on the construction, heating and ventilation of hot-houses; : including conservatories, green-houses, graperies and other kinds of horticultural . o c^ Fig. 53. Fig. * Wyman on Vent. 278 METHODS OF VENTILATION. whole house may be aired in the space of one minute; or asmany houses as may be in the range. This is eflected by a rodpassing along the whole length of the house. A pulley is fixedimmediately above each ventilator, and another placed oppositeit upon the rod, as shown in Fig. 51. A piece of chain or cordis attached to the ventilator at one end; and passing over thepulley, as shown at a, Fig. 52, is then fixed to the pulley placedopposite it upon the rod. A larger wheel, or pulley, is fixed atone end of the rod, (^,) to which is attached a chain, connectedwith a crank, situated within the reach of a person standing onthe floor. This crank is fixed on the back wall, as seen at c,Fig. 52. From the foregoing cuts and description it will be perceivedthat, by giving the crank (d) a few turns, the whole of the ven-tilators will be opened. The crank is provided with a racket, sothat they may be opened to any distance, from half an inch tothe full h
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