Transcriber’s Note
Cover created by Transcriber, using an illustration from the original book, and placed in the Public Domain.
LIGHTSHIPS AND LIGHTHOUSES
By permission of Messrs. Siemens Bros. & Co., Ltd.
THE 43,000,000 CANDLE-POWER BEAMS THROWN FROM THE HELIGOLAND LIGHTHOUSE.
Being projected from a height of 272 feet above the sea, the beacon has a range of 23 miles, and on a clear night the rays are seen from Büsun, 35 miles away.
Frontispiece.
CONQUESTS OF SCIENCE
LIGHTSHIPS AND
LIGHTHOUSES