Fig. 26 



SUNLIGHT CURVES IN STREETS 



The three upper diagrams are for a street running north and south, the three middle dia- 

 grams for a street running east and west, and the three lower diagrams for a street running at 

 an angle of 45 degrees with the meridian. The diagrams of the left-hand column are drawn for 

 the winter solstice; of the centre column for the vernal and autumnal equinox; and of the right- 

 hand column for the summer solstice. The zones between the curves are shaded in a series of 

 tints, the lightest zone being in sunlight between eight and nine hours, and the solid black being 

 without sunlight. The diagrams give the complete series of sunlight curves at typical seasons 

 for streets running north-south, east-west, and at an angle of 45 degrees with the meridian. 

 The height of the buildings is represented as one and one-half times the width of the street. 

 In the north-south street the distribution is symmetrical, the buildings on either side receiving 

 an equal amount. In the east-west street the surface of the street receives no sunlight at all 

 during six months of the year, and the buildings on the south side are in perpetual shadow during 

 the same period. In planning towns the east-west street should be avoided as far as possible 

 and, where unavoidable, the buildings should be of moderate height and built in detached blocks. 

 In the checkerboard plan the best distribution of sunlight is obtained when streets run north- 

 east-southwest and northwest-southeast. " The Orientation of Buildings," by Wm. Atkinson, 

 Fellow Boston Socy. of Arch. 



See pages 71 and 96. 



