PARK LIGHTING 



807 



adjacent court is to be lighted, each row of lighting units should be con- 

 trolled separately by means of a switch placed conveniently on one of the 

 poles so that units not needed may be turned off. In some instances the 

 units have been supported by means of a steel cable stretched between 



PLATE Xo. 301 



VIEW OF TENNIS LIGHTING SYSTEM SHOWING AN OUTSIDE AND 

 MIDDLE ROW OF LIGHTING UMTS 



poles, two or three poles per string of units being used. To prevent the 

 reflectors from swaying in the wind, it is necessary to stretch a small wire 

 between the poles and attach it to the rim of each reflector. Obviously, a 

 disconnecting hanger cannot be used, so that the maintenance of such a 

 system is not as easy as in the case of the one recommended above. 



TABLE B. MATERIAL NECESSARY FOR ONE ROW OF UNITS 



Poles. Three 45-foot wooden poles set six feet in the 

 ground. 



Bracket arms. Two i6-foot bracket arms; two 20- 

 foot bracket arms; one 2-foot bracket arm. This is 

 to be omitted when ordering for a row between adja- 

 cent courts. (On the row of units between courts the 

 two center reflectors are attached to the 2O-foot 

 bracket.) 



Lighting units. Five i,5OO-watt or 2,5OO-watt 

 mazda C lamps (six required for a row of units between 

 courts); five deep bowl spun aluminum reflectors, such 



as the Ivanhoe No. 865 (six required for a row between 

 courts); five aluminum reflecting skirts, such as the 

 Ivanhoe No. 867. (Omit this item when ordering for a 

 row between courts.) 



Accessories. Five disconnecting hangers, such as the 

 Thompson No. 94A (six required for a row between 

 courts); five pulleys (six required for a row between 

 courts); 215-foot steel chain and fittings. Add 60 feet 

 when ordering for a row between courts; one loo-ampere 

 switch. 



SECTION II 

 THE ILLUMINATION OF PARKS, PARKWAYS AND PLAYGROUNDS 1 



Desirability. The desirability of adequately illuminating all public 

 grounds which are open to use during the period of darkness is unques- 

 tioned. The intensity to which such grounds should be illuminated is 

 dependent upon the service which such areas are intended to give. Unfor- 



1 The data herewith presented is the result of a year of painstaking study, preparation of plans and estimates, 

 and testing out of different lighting units by the engineers of the Department of Parks, Minneapolis, Minnesota. 

 The data was originally published in Parks and Recreation, Vol. IX, No. 2, May-June 1926, pages 542-551. 



