Exhibit: Focimeter, an instrument for ascertaining the difference in the lengths of the optical and chemical focus of photographic lenses.

You found 22 exhibits by:
Knight, George & Sons, ordered by EXHIBITION CATALOGUE NUMBER

Record 7 of 22

Exhibition:	1851, London, Great Exhibition	More from this exhibition >
Exhibit number:	453.07, v 1, Class10, United Kingdom

Photographer:	Knight, George & Sons	More by this photographer >
Full title:	Focimeter, an instrument for ascertaining the difference in the lengths of the optical and chemical focus of photographic lenses.
Process:	Not Listed [Apparatus]	More by this process >

Original price:
Exhibitor:	Knight, George & Sons