Account of the Skerryvore lighthouse

by Alan Stevenson

J. Andrews Del^t. W. H. Lizars Sculp^t.

1^st.
ORDER of LIGHTS.

CONCAVE MIRRORS.

Stevenson’s Account of Skerryvore Lighthouse.

FIXED
CATADIOPTRIC LIGHT
OF 1^st. ORDER
ONE NINETEENTH OF FULL SIZE

PLATE XVII.

REFERENCES.

A B C. CATADIOPTRIC ZONES.
D E F. COMPOUND DIOPTRIC BELT WITH DIAGONAL JOINTS C N M.
A′ B′ C′. LOWER CATADIOPTRIC ZONES ONE DIVISION BEING LEFT OUT FOR FREE ACCESS TO THE LAMP.
F. FOCUS WITH FLAME OF LAMP.