. An elementary book on electricity and magnetism and their applications. ew blackened bulbs. 5. Dont save light at the expense of your eyes. 324. Street lighting. Except for advertising or decorativepurposes, such as shown in figure 334, the object of streetlighting is to promote public safety and to facilitate traveland business at night. In this country there has been anenormous improvement in the standards of street lighting,but there is still great diversity between theory and lighting has too often in the past been considered asa political job rather than as an importa
. An elementary book on electricity and magnetism and their applications. ew blackened bulbs. 5. Dont save light at the expense of your eyes. 324. Street lighting. Except for advertising or decorativepurposes, such as shown in figure 334, the object of streetlighting is to promote public safety and to facilitate traveland business at night. In this country there has been anenormous improvement in the standards of street lighting,but there is still great diversity between theory and lighting has too often in the past been considered asa political job rather than as an important public servicerequiring the highest engineering skill. Both arc lamps and incandescent lamps are now used ex-tensively in street lighting. Large units, such as the electricarcs of carbon, flame, and metallic oxide, are most effectivewhen suspended at a height of from 20 to 30 feet above thecenter of the street. Small units, such as the gas-filled in-candescent lamp, are usually mounted on standards or bracketsfrom 7 to 10 feet high upon the curb line. The spacing on. Fig. 334. — Statue of Liberty illuminated at night by means of 15 batteries offlood-lighting projectors using 250-watt tungsten lamps. ELECTRIC LIGHTING 473
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmagnetism, bookyear19
