A 4th order drum Fresnel lens by Chance Brothers & Co of Smethwick, England, circa 1910.

4 section drum lens, each section marked TOP, one section opens and can be locked with the catch.

Removeable circular top lens with copper extending chimney.

Bronze frame with CB and numerical markings.

Height: 63.5 cm. Without the top lens: 43.5 cm

Diameter: Exterior diameter 60 cm. Interior diameter: 50 cm.

Chance Brothers and Company glassworks was established in 1822, Spon Lane, Smethwick, West Midlands  England. From 1851, Chance Brothers became a major lighthouse engineering company, producing optical components, machinery, and other equipment for lighthouses around the world.