812 PARKS 



be tested and demonstrated so as to ascertain the most pleasing effect with 

 intensities of from 0.05 to 0.2 foot candles and uniformities of approxi- 

 mately 8 to I. 



Testing and demonstrations. In the illumination of the park and park- 

 way system and the selection of a proper installation, the following parties 

 were interested: 



1. The board of park commissioners, responsible to the public for the 

 service to be given and its cost. 



2. The City of Minneapolis, which through its city council is con- 

 fronted with a similar problem on residential streets. 



3. The Minneapolis General Electric Company, which will furnish 

 electric current and maintenance service. 



4. The manufacturers of lighting equipment. 



In consideration of all parties interested and in order to make tests 

 of the qualities of the different lighting fixtures and equipment now on the 

 market, also to experiment with the efficiency of the different heights of 

 mountings and for the purpose of demonstration to the board and all 

 others interested in the subject, test lights were erected on a section of 

 St. Anthony Boulevard and experiments conducted for several months. 



Installation. All units were installed in the positions which they 

 would likely occupy in actual performance on the parkways. 



Twelve temporary lighting poles were installed on the parkway at 

 equal spacings of 156 feet, every other pole being on the same side of the 

 roadway. On each pole was placed a pendant unit and an upright unit. 



Poles were placed two feet back of the curb line and pendants were 

 hung on five-foot bracket arms with arrangements for varying heights. 



A long arm was used, as this was necessary in case of actual installa- 

 tion on most parkways, due to the interference of tree foliage. 



Upright units were mounted at a height of 15 feet, the highest practi- 

 cal mounting height considered to be good practice for such units. 



Pendant units were tested at 18^ and 21 feet, 18^ feet being the 

 lowest that gave desired uniformity and elimination of excessive glare, 

 and 21 feet the maximum height that could be used on the parkways on 

 account of the shade trees. 



All pendant units were on one circuit and all upright units on another. 

 A 6.6 ampere constant current series circuit was taken out of a tub trans- 

 former which was across a 2,3OO-volt line leading to the St. Anthony Golf 

 Building. 



Each circuit was operated by a double-throw switch across the sec- 

 ondary from the transformer. 



All readings were taken with a Macbeth Illuminator along the center 



