Abstract :
The city of Hamilton, Ohio, has recently installed a modern street lighting system which makes this city at night one of the best lighted cities in that state. The early system, now displaced, consisted of about 750 enclosed carbon arc lamps haphazardly located and mounted at various heights. The. illumination received from it was quite low. The new system now in use consists of approximately 1500 incandescent units of the dome refractor, rippled glass globe type, equipped with lamps ranging in size from 2500 lumens (250 c. p.) in the outlying districts up to 10,000 lumens (1,000 c. p.) in the downtown business districts bordering on the White Way. The white-way system (located in the main business district) is lighted with 300-watt, 110-volt, multiple lamps installed in upright encasing units on single light standards spaced 60 feet apart. This part of the lighting system formerly consisted of five-light clusters with four 60-watt and one 100-watt incandescent lamps. The new units are superior both as to effectiveness and economy. A tsome future time this white-way system will be changed from multiple to series. In the downtown districts the 1,000-lumen pendant units are mounted 20 feet high and spaced 300 feet apart. On the wide streets the lamps are mounted on both sides of the street and staggered so as to give the proper distribution of light for both automobile drivers and pedestrians; on narrow streets in this district the lamps are mounted on one side only. In certain locations the height and density of the tree foliage necessitates a mounting height of about 16 feet. In the residential sections of the city 4000- and 6000-lumen (400- and 600- c. p.) lamps are used in pendant fixtures. The units are spaced from 300 to 400 feet apart and are mounted approximately 18 feet above the street. While supplying much better street illumination in every way than the earlier lighting system, the new system requires less power for its operation than the earlier one.
