A Rare Cretes Opthalmic Slide Rule, French, circa 1875,signed in manuscript Regles Calcul du Dr A Cretes. Cretes Optician Rue de Rennes 66 Paris, brass surround, card scale and slide, instructions in manuscript on the reverse,
14in (36cm) long FootnotesDesigned by the eminent ophthalmologist Dr Emile Javal and used to calculate spectacle lens prescriptions.
Exhibited:
Scientific Instrument Society 25th anniversary exhibition, Museum of the History of Science, Oxford, 2008.
A Rare Cretes Opthalmic Slide Rule, French, circa 1875,signed in manuscript Regles Calcul du Dr A Cretes. Cretes Optician Rue de Rennes 66 Paris, brass surround, card scale and slide, instructions in manuscript on the reverse,
14in (36cm) long FootnotesDesigned by the eminent ophthalmologist Dr Emile Javal and used to calculate spectacle lens prescriptions.
Exhibited:
Scientific Instrument Society 25th anniversary exhibition, Museum of the History of Science, Oxford, 2008.
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