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Physics Museum
Photometers
In its widest sense, a photometer is an instrument for measuring light intensity or optical properties of solutions or surfaces. Photometers are used to measure: This article is licensed under the GFDL. It uses material from Wikipedia content.

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Early 20th C (mostly) physics laboratory apparatus typically found in schools and universities, collected by Alan Richmond. Some items are offered for sale on Curious Minds (science shop).