On a simple method of distributing naturally diverging rays of light over any Azimuth angle : with a description of proposed spherico-cylindric and double-cylindric lenses, for use in lighthouse illumination /
Stevenson, Thomas,1818-1887.
Edinburgh : Printed by Neill and Company,
1855.
"From the Edinburgh new philosophical journal, new series, April 1855."
Lenses
Lighthouses
Azimuth
Scotland Edinburgh.