. Lighthouse construction and illumination; . LONDON AND NEAV YOEKE. & F. N. SPON MDCCCLXXXI Printed by R. & R. Clark, Edinburgh. TO §ir John gatokshato, L. & E., , PRESIDENT OF THE INSTITUTION OP CIVIL ENGINEERS. MY DEAE HAWKSHAW, I beg leave to dedicate to you the followingpages, not only on account of the distinguished posi-tion which you justly hold in the profession, but as amark of my great personal regard and friendship. Very truly yours, THOMAS STEVENSON. Edinburgh, December 1880. PEEFACE. In the following pages I have done my best to give acondensed statement, 1
. Lighthouse construction and illumination; . LONDON AND NEAV YOEKE. & F. N. SPON MDCCCLXXXI Printed by R. & R. Clark, Edinburgh. TO §ir John gatokshato, L. & E., , PRESIDENT OF THE INSTITUTION OP CIVIL ENGINEERS. MY DEAE HAWKSHAW, I beg leave to dedicate to you the followingpages, not only on account of the distinguished posi-tion which you justly hold in the profession, but as amark of my great personal regard and friendship. Very truly yours, THOMAS STEVENSON. Edinburgh, December 1880. PEEFACE. In the following pages I have done my best to give acondensed statement, 1st, Of the facts and principles whichregulate the design and construction of Lighthouse Towersin exposed situations ; and 2d, Of the practical application ofoptics to Coast Illumination. The history of the introduc-tion of the optical agents, and their combinations to meetdifferent requirements, have, so far as consistent with a clearexposition and division of the subject, been arranged in thechronological order of their publicalighthouseconstr00stev
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