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Snellen Vision Testing Cards Set for Railway, Marine and School Exams, Early 20th C. pretty abacus 6 1/2" long x 4

SKU 34552996725
4.3
Snellen Vision Testing Cards Set for Railway, Marine and School Exams, Early 20th C. pretty abacus 6 1/2
Snellen Vision Testing Cards Set for Railway, Marine and School Exams, Early 20th C. pretty abacus 6 1/2
Snellen Vision Testing Cards Set for Railway, Marine and School Exams, Early 20th C. pretty abacus 6 1/2
Snellen Vision Testing Cards Set for Railway, Marine and School Exams, Early 20th C. pretty abacus 6 1/2
Description

6 1/2" long x 4 1/2 tall

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The scalene triangle is marked with a Sphynx logo

Tall and with graceful

Snellen Vision Testing Cards Set for Railway, Marine and School Exams, Early 20th C. pretty abacus 6 1/2" long x 4Found in their original envelop, with Millar and Wel_ (?) Opticians on, Boston stickeron the face and instruction card still inside, this appears to be a complete, or nearly so, set of early 20th c. Snellen vision testing cards. Nineteen cards total, plus instruction card, with three of the cards showing railway signals to be read at a distance of 20 feet as these were commonly used for testing the vision of train conductors railway workers. Included:

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