This is a reprint in the form of scanned images of
Henker, Otto. "Binocular Instrument." in Encyclopædia Britannica. Eleventh Edition. ("Handy Volume Issue") NY: Encyclopædia Britannica Company, 1910. Vol. III, pp. 949-951.
The notes on the contributors describe Otto Henker, Ph.D. as "On the staff of the Carl Zeiss Factory, Jena, Germany" (xi).
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