Greenhouses, their construction and equipment . 40 GREENHOUSES boiler pit, or in large establishments by theuse of pumps or steam traps which will bediscussed in the chapters on heating. Size of House.—There is no authentic dataon the comparative efficiency of small andlarge houses. The large houses are relative-ly lighter, but there are other considerations. Sf «vicf Building BOILCR Moo/t s— 1 z d 4 5 6 7 8 ^ 10 11 12 15 Il- ls It u 18 19 20 11 i7ff ( -Vft Fig. 22.—Ground plan of range shown in Fig. 21 As a rule the eastern growers favor separatelarge, high and wide houses while those ofthe M
Greenhouses, their construction and equipment . 40 GREENHOUSES boiler pit, or in large establishments by theuse of pumps or steam traps which will bediscussed in the chapters on heating. Size of House.—There is no authentic dataon the comparative efficiency of small andlarge houses. The large houses are relative-ly lighter, but there are other considerations. Sf «vicf Building BOILCR Moo/t s— 1 z d 4 5 6 7 8 ^ 10 11 12 15 Il- ls It u 18 19 20 11 i7ff ( -Vft Fig. 22.—Ground plan of range shown in Fig. 21 As a rule the eastern growers favor separatelarge, high and wide houses while those ofthe Middle West prefer lower and narrowerconnected houses. The present tendency isto build larger houses than formerly. Ofi6o florists and vegetable growers whom theauthor has consulted, 148 or 88 per cent, ex-pressed themselves in favor of houses rang-ing from 24 to 40 feet in width. These areundoubtedly the most popular widths at thepresent time, the length varying from 100 GENERAL CONSIDERATIONS 41. 43 GREENHOUSES to 500 feet or more. A discussion of the ad-vantages of high, wide, single houses and oflow, narrow, connected houses is given inChapter IV. Pitch of Roof.—The pitch of a roof meansthe degree of slant or the angle of divergencefrom the horizontal. The glass of the roofnot only allows the light, heat and chemical .^ c 20Ft. Fig. 24.—The pitch of the roof is measured at A rays to pass through it, but it also acts tosome extent as a mirror, thus reflecting apart of the rays. The amount lost by re-flection is proportional to the angle of in-cidence. Thus, if the suns rays fall uponthe roof at right angles, little or none is lostby reflection; but when they fall at a less GENERAL CONSIDERATIONS 43
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