National Geographic : 1913 Jan
THE PETIT MANAN LIGHTHOUSE, MAINE A granite tower, 115 feet high. The light is white, fixed and flashing, showing a steady light for I minute, and a 5-second flash in the next minute. The -fog signal is a steam whistle giving each minute two blasts of 5 seconds each. THE ST. JOHNS RIVER LIGHT, FLORIDA A brick lighthouseattheentrance to St.Johns River. A fixed white light, without fog signal. This light was recently changed from an oilwick lamp toanincandescent oil vapor lamp, increasing thecandle power from 860to13,000.