. Official proceedings . t to thecourse lights, giving them a distinctive flash, synchronized withthe beacon flash. On sections of the airways where electric service is notconveniently available, acetylene flashing beacons are spacedat three-mile intervals. The unit consists essentially of a double 51 lantern, one mounted above the (jther. The top hmtern is anazimuth and zenith light having a separate flasher, operatingat 40 flashes of .j(»() c. p. per minute. The lower lantern is acourse light with a 15-degree horizontal beam spread rated at5000 c. p. operating at 20 flashes per minute. This
. Official proceedings . t to thecourse lights, giving them a distinctive flash, synchronized withthe beacon flash. On sections of the airways where electric service is notconveniently available, acetylene flashing beacons are spacedat three-mile intervals. The unit consists essentially of a double 51 lantern, one mounted above the (jther. The top hmtern is anazimuth and zenith light having a separate flasher, operatingat 40 flashes of .j(»() c. p. per minute. The lower lantern is acourse light with a 15-degree horizontal beam spread rated at5000 c. p. operating at 20 flashes per minute. This type ofbeacon is quite relial)le with its dual lantern and operates with-out attendance for periods of six months or more. Emergency landing fields are located at intervals of 30miles and each is usually equipped with a standard rotatingbeacon, an illuminated cloth cone wind indicator, and boundarylights on the landing area. The construction and illuminationof airports does not come under the jurisdiction of the Depart-. 24-inch Chromilite projector designed for use with a 3,000 watt lamp tofloodlight aviation landing fields. ment of Commerce but if certain conditions are complied with,they will be given a definite rating for size, service facilities,and night flying facilities. Airports which are completelyequipped receive first consideration for inclusion on contractair mail routes established by the U. S. Post Office following classified types of lighting are required by theAirport Rating Regulations established by the Department ofCommerce:—airport beacon, illuminated wind direction indicator,Ijoundary lights, obstruction lights, building floodlights, ceilingprojector, and landing field floodlights. The requirements of a satisfactory beacon light are ade-quate candlepower, not less than 100,000 for long range; properdistribution of light in the vertical plane to make the beaconvisible all around the horizon and to the zenith, or nearlv so, 52 tor altitudes
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