File:Grubb reflector sight - third version.png

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English: Reflector sight designed by Sir Howard Grubb in cooperation with J. Emerson Reynolds and G. Rudolf Grubb, third and final version.
Date circa 1901
date QS:P,+1901-00-00T00:00:00Z/9,P1480,Q5727902
Source Howard Grubb: A New Collimating-telescope Gun-Sight For Large And Small Ordnance. In The Scientific transactions of the Royal Dublin Society. Vol. VII, August 1901. S. 321–330 (Online).
Author Unknown authorUnknown author
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