. A dictionary of modern gardening. Gardening. ST 0 560 S TO is desired, the latitude being 51° 31\ and the sun's declension then 16° 36^ north, therefore the roof ought to slope at an angle of 34° 55' Fig. In latitude 52°, Mr. Knight found from lengthened experiments, that the best angle is about 34°, considering the services of a hot-house through the year, and to illustrate this, he gave the" pre- ceding diagram. About the middle of May, the elevation of the sun at noon corresponds nearly with the asterisk a; in the beginning of June and early in July it will be vertical at b, an
. A dictionary of modern gardening. Gardening. ST 0 560 S TO is desired, the latitude being 51° 31\ and the sun's declension then 16° 36^ north, therefore the roof ought to slope at an angle of 34° 55' Fig. In latitude 52°, Mr. Knight found from lengthened experiments, that the best angle is about 34°, considering the services of a hot-house through the year, and to illustrate this, he gave the" pre- ceding diagram. About the middle of May, the elevation of the sun at noon corresponds nearly with the asterisk a; in the beginning of June and early in July it will be vertical at b, and at midsummer at c. only six degrees from being vertical. The asterisk d points out its position at the equinoxes, and e its position at midwinter. If the best glass be employed, it is an excellent plan to have it put double in each sash, an interval of half an inch being left between the two panes, and a small hole at the corner of the inner one to prevent the glass being broken by the expansion or contraction of the air be- tween. This confined air is one of the worst possible conductors of heat, keep- ing the house from being rapidly cooled during the coldest weather, and thus is effected a very great economy of fuel, whilst little or no interruption is caused j gal to the entrance of light.—Trine Gard. Glazing, or the mode in which the glass is inserted in the frames, is a very important consideration; for if done imperfectly, moisture from rain, dew, or vapour condensed within the house penetrates between the rebate of the frame-work and the glass, or between the laps of the panes themselves, and expanding in the act of freezing unfail- ingly cracks them. Again, if the panes fit tightly into the rebates, any sudden expansion causes a similar fracture. Mr. Seymour, gardener to the Count- ess of Bridgewater, at Ashridge Park, has these sensible remarks upon the subject:— " There ought to be three or four sizes of panes used in horticultural struc- tures ; supp
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectgardening, bookyear18
