Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 167,689 pages of information and 247,075 images on early companies, their products and the people who designed and built them.
Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 147,919 pages of information and 233,587 images on early companies, their products and the people who designed and built them.
278. HYAMS, HYAM, 59 Cornhill — Inventor and Manufacturer.
New object-glass, acting as a telescope or opera-glass, and consisting of only a single piece of glass or lens, in the shape of a truncated cone, having a convex surface at the base or large end, and a concave surface at the other.
Improved Stanhope lens of a conical shape.
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