8io PARKS 



feet. In the lighting of the parks and playgrounds, the location of stand- 

 ards is dependent upon physical features such as trees, walks, water areas, 

 playground equipment, etc., and no fixed spacing can be adopted. 



2. Arrangement of lights. Because of the spacing selected as above 

 and fixed by the distance between street intersections, a staggered arrange- 

 ment of lights is in most instances necessary to avoid interference of the 

 shade trees planted along the roadways. 



3. Heights of mounting. It has been determined by careful study and 

 tests that the height of mountings should be about one-eighth of the dis- 

 tance of spacing, making the heights and spacings as follows: 



Heights of Standards Distance between Standards 

 10 feet 80 to 90 feet 



15 feet 120 to 130 feet 



1 8 feet 140 to 150 feet 



20 feet 1 60 to 170 feet 



23 feet 185 to 200 feet 



These mounting heights are, however, subject to regulation on account 

 of trees, which may interfere with such uniform height of mountings and 

 consequently their spacing. The mounting heights in playgrounds depend 

 entirely upon existing physical features. 



4. In general, all park roadways are 32 feet in width and the parkway 

 designs are such that a future width of 40 feet is the maximum obtainable. 

 This factor determined the location of the lamp standards relative to the 

 curb line. 



5. A standard type of pavement has been adopted by the board. 

 This pavement, known as bituminous macadam and so constructed as to 

 have at all times an appearance similar to a gravel road, without percep- 

 tible reflection of light or creation of reflected glare, does not assist in adding 

 to the brightness of the street and influences the selection of types of 

 glassware. 



6. Parkways in residential sections as a rule have front lawns and 

 gardens with buildings set back quite a distance so that they will not reflect 

 light and assist in intensity of illumination. 



Determining factors. These factors and the general effectiveness of the 

 illumination will be determined. 



1. Location of light relative to roadway. 



2. Width of roadway. 



3. Nature of pavement or reflecting areas. 



4. Proximity of buildings. 



5. Spacing of lights (distance between standards). 



