126. Ross Rapid Symmetrical Lens, 1875

Signed: 'Ross. N1 20693 LONDON 73 x 42 Rapid Symmetrical' and 'A.D. 1875'.

Symmetrical meniscus doublet f13 lens of 150 mm focal length with between lens slit for Waterhouse stops.

Length 55 mm, diameter 35 mm.
Inventory no. 77,248.