Account of the Skerryvore lighthouse

by Alan Stevenson

Section across Gates.

SINGLE BOOM

PLATE XII

J. L. Kerr, del^t. Eng^d. by W. & A. K. Johnston Edin^r.

Stevenson’s Account of Skerryvore Lighthouse.

ANNULAR LENS OF FIRST ORDER
SCALE 1¹⁄₈^th.. FULL SIZE

PLAN

SECTION THROUGH A.B.

TABLE OF ELEMENTS OF LENS
IN MILLIMÈTRES