Manufactured in 1935, this experimental perimeter is the invention of American Optical, the pioneer scientific instrument manufacturer founded by William Beecher in 1833. The company later changed its names to American Optical during 1869-1982, and known today as Reichert Ophthalmic Instrument.
Luckily, we came across this one, which is still in a very good condition.
Ref: http://www.dickwhitney.net/aoscientif.htm
Cheers,
The Chemical Cosmos.
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