Abstract
The transmission of solar radiation was measured at various positions in a 63 ft wide glasshouse orientated E.-W. The obstruction to diffuse radiation caused by the various components of the structure was found by making measurements on overcast days during the course of construction. Measurements were made on sunny days at three periods of the year in the completed house, and simultaneous measurements of the proportion of diffuse radiation outdoors made it possible to calculate separately the transmission of the direct component. The mean daily transmission of the direct component was 57% in summer and 68% in winter; that of the diffuse component was 69%. During winter, the transmission of direct and diffuse radiation combined was much greater than in a 30 ft vinery house having a N.-S. orientation. The south half of the house compared favourably with a narrow E.-W. orientated propagation house. Changes in shape could lead to improvements in the transmission, particularly in that of direct radiation.
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