National Geographic : 1913 Jan
THE ORIGINAL THIMBLE SHOAL LIGHT STATION, VIRGINIA THE THIMBLE LIGHT STATION AFTER A SCHOONER HAD COLLIDED WITH IT AND SET IT ON FIRE A temporary light is shown, pending the building of a more substantial structure, now under way while the consumption of oil has been reduced from 2,280 gallons to 1,300 gal lons a year. Electric lights are used at a few light stations only. The expense is too great to warrant the employment of electricity at many important stations. For some harbor lights it can be used to advantage by taking current from a local source of supply, and a light can thus be main tained in an exposed position and con trolled from the shore. The electric light at Navesink, on the highlands just south of New York har bor, is the most powerful coast light in the United States. This light shows each five seconds a flash of one-tenth second duration estimated at 6o million candle power. Although, on account of the curvature of the earth, the light it self cannot be seen more than 22 miles, its beam has been reported to have been observed in the sky at a distance of 70 nautical miles (see page 39).