Greenhouses; Their Construction and Equipment

Greenhouses; Their Construction and Equipment

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 edition. Excerpt: ... Ladder.--Another device used more in painting than in glazing is a ladder Fig. 65.--Glazing ladder used in glazing and painting made by nailing cleats on one side of a plank for foot holds, and on the other side longer cleats so that they will rest across at least two sash bars and thus distribute the weight. The ladder is held in place by hooks which reach over the ridge. CHAPTER VIII VENTILATION AND VENTILATING MACHINERY Greenhouse ventilation has not yet been worked out with the same care and precision as has the ventilation of dwellings, public buildings, or even barns for the use of live stock. On the other hand, greenhouses are seldom or never built without some special attention being given to the question of ventilation, whereas, dwellings and even public buildings are often erected without any reference whatever to this important subject. This anomaly may be partly explained by the following facts: (1) The transpiration of plants is not so well understood nor is it so easily measured as is the transpiration of animals. (2) Windows are necessary in dwellings and public buildings to admit light and they may be utilized, when necessary, to provide ventilation. (3) In greenhouses, ventilation is not only provided for the purpose of 121 maintaining a supply of fresh air, but is utilized as a method of controlling temperature and humidity. (4) Greenhouses, because of their transparent roofs, are much more liable to sudden or violent changes in temperature (especially in days of alternate clouds and sunshine) than are dwellings, and the necessity for ventilation in order to equalize the temperature is evident. (5) Greenhouse plants are, as a rule, particularly sensitive to cold drafts, and ventilation cannot be left to the indiscriminate...show more

Product details

  • Paperback | 40 pages
  • 189 x 246 x 2mm | 91g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236593731
  • 9781236593733