Optómetro (1) - Madera metal - Finales del siglo XIX

Descripción
Optómetro (1) - Madera metal - Finales del siglo XIX
Francia

George J. Bull was an American physician who did research at the Sorbonne in Paris, along with Dr. Javal.
The optometer consists of a 57 cm long slat with a screw-off handle at the bottom. On one side there is an inspection hole with 3 lenses that can be placed in the front (+5.00, +10.00, -10.00). On the slat itself there is a kind of dial. The following scales are also applied to the bar: one in cm, one in dioptres and one in thumbs and a scale corresponding to age.
An identical model is located in the University Museum in Utrecht. The original (French) instructions for use are present. The transport box is slightly damaged.

Detalles del lote
N.º de artículos
1
Objeto
Optómetro
Material
Madera metal
Diseñador/artista
George J Bull
Fabricante/marca
Potzl
Periodo estimado
Finales del siglo XIX
País de origen
Francia
Estado
Buen estado - usado y con signos menores de los años
Dimensiones
8×60×7.5 mm
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