A chart exhibiting the light houses and light vessels on the coasts of Great Britain and Ireland; and also those on the N.W. Coasts of Europe between Ushant and Bergen ... /
Findlay, Alexander G.
Laurie, Richard Holmes.
London : R.H. Laurie,
1863.
Shows the extent of the beam of each lighthouse, and gives information about the type of beam and frequency of light pulses.