1851 Great Exhibition: Official Catalogue: Class X.: John Braham
289. BRAHAM, JOHN, 17 St. Augustine's Parade, Bristol - Manufacturer and Inventor.
Spectacles, from their earliest invention: various modes adopted by Sir Isaac Newton, Drs. Kitchiner, Wollaston, and Herschel.
Perfect and imperfect lenses.
Lenses, from 60 inches to 1.5 inch focus.
Meniscus and double-convex lenses.
Specimens of Brazilian crystal.
Mode of producing convex and concave lenses for spectacle-eyes.
Improvements on Wollaston's principle of curved lenses.
Model of the eye.
Spectacles without rims; and hand-frames.
Patent pantoscopic spectacles, in gold, silver, steel, and shell mountings.
Double pantoscopic lens, for near and far sight; the same worked in one disc of glass (two pairs).
Registered trigonometer, for measuring and protracting angles from a centre.
Herapath's registered gas blow-pipe.