Set of 4 condensing lenses, an optical lens, spectroscopy lens holder, and 3 books on lenses and prisms. 19th and 20th century.
3 lenses are 6 in. diameter. Biconvex lens is 19th century aqua-glass, 3 5/8 in. diameter. Brass and steel mounted lens is 3 5/8 in. diameter.

Painted steel lens holder, with two lenses mounted. Approximately H: 14 x W: 18 x D: 5 1/2 in. and

Books include the following titles: Prism and Lens Making by Twyman (1957); Mirrors, Prisms, and Lenses by Southall (1933); Lens-Work for Amateurs by Orford (1894).

Books are blue cloth bound, approximately 600 pp., with illustrations and indices.

Poor. One of the lenses has a significant chip. Scratches throughout the lenses. Books are bumped, rubbed, and scuffed. The Orford book is separating at panels, with slight losses to head and tail of spine and corners. Toning and foxing throughout.