Light and lighting . of drivers and pedestriansand directing most of the light on theroadway. With the coming of more abundantsupplies of light, people seem to havebecome more careless how it is thoughtful observers agree that thepresent street lights err on the side of glare. They illuminate the pavementbrightly, but they also throw their raysinto the eyes of passers by, producing aninconveniently dazzling effect. Seeinghow rapidly a driver of a motor-vehiclemust steer, it would not be .urprising ifthe sudden exposure to these brightlights were sometimes the cause of an accident, an
Light and lighting . of drivers and pedestriansand directing most of the light on theroadway. With the coming of more abundantsupplies of light, people seem to havebecome more careless how it is thoughtful observers agree that thepresent street lights err on the side of glare. They illuminate the pavementbrightly, but they also throw their raysinto the eyes of passers by, producing aninconveniently dazzling effect. Seeinghow rapidly a driver of a motor-vehiclemust steer, it would not be .urprising ifthe sudden exposure to these brightlights were sometimes the cause of an accident, and, as a matter of fact, collisionshave occurred which were ascribed to thiscause. No doubt before long enlightenedpublic opinion will insist on bettermethods of screening public lamps, andon their use high up at a reasonabledistance from the eye. Sometimes theglaring effect is intensified by the factthat new and more powerful illuminantsare planted on lamp-posts intended inthe past for lamps of far lower Fig. 7. — Ornamental standard in TrafalgarSquare, once equipped with flat-flameburners giving about 120 , now carry-ing high-pressure gas lamps giving severalthousand candle-power. It is suggestedthat these lamps, being at such a low level,should preferably be screened to someextent from the eyes of passers-by. As an instance may be mentioned themassive three-light post on the island inTrafalgar Square. In the past the lightin each of these globes came from acluster of Sugg flame-burners givingperhaps 120 candle-power ; to-day, 2,0C0candle-power high-pressure gas lampshave been substituted in each lantern,and this powerful light is concentratedwithin a, much smaller area than was thecase with the old flat-flame lamps, it may lie suggested, wouldanswer their purpose better if the direct 12G THE ILLUMINATING ENGINEER (march) rays were screened from the eyes ofpassers-by. Similar considerations applyto the use of powerful hb_h-pressure gaslights an
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