816 PARKS 



the mounting height varying from 15 to 30 feet. The 3O-foot height is 

 required for the lighting of skating rinks and playfields, in order to obtain 

 uniformity with lights placed around the edge of the field. 



Lamps and glassware. Park lamps shall be i5O-watt multiple lamps 

 encased in small Washington-type alabaster globes without refractors. 

 This unit, designed for park lighting in Washington, D. C., has been very 

 satisfactory. 



Playground lamps shall be of the height and intensity as indicated on 

 the various plans and shall be of the same type as designated for similar 

 heights on parkways. 



The 3<D-foot standards shall be equipped with 5OO-watt multiple lamp 

 encased with General Electric Company No. 108 clear rippled globe. This 

 type is now being used satisfactorily in the lighting of our playfields. 



Parkway lighting shall be 4,000 or 6,000 lumen, 20 ampere series lamps 

 for tip down burning, as indicated on the various plans. 



Bowl refractors with a characteristic candle power curve similar to 

 Holophane No. 4435 S. F., or No. 4238 S. F. are recommended. 



The design of the dustproof hood shall be such that the refractor and 

 hood will form a complete and symmetrical unit and harmonize with the 

 design of the standard. The hood and refractor should be suitable for 

 4,000, 6,000 or 10,000 lumen lamps. 



Upkeep. Items in upkeep charge (yearly) : 



(a) Maintenance and current. 



(b) Depreciation reserve. 

 (c} Interest on investment. 



Maintenance. The Minneapolis General Electric Company tenta- 

 tively agrees to furnish current and maintain the lighting system for the 

 board. Maintenance includes the following: 



(a) Furnish all lamp transformers and control equipment. 



(b) Turn lamps on and off. 



1. Daily. 



2. Yearly. 



(c) Maintain lamps. 



1. Replace burned out lamps. 



2. Replace broken lamps. 



3. Replace blackened and inefficient lamps. 



4. Furnish all lamps for replacement. 



(d) Maintain globes. 



1. Clean globes. 



2. Replace broken globes. 



