13 THE WOODSMAN S HANDBOOK. 
to the object sighted is visible to him in the mirror below the 
sight opening through which he is looking, and is in the same 
vertical line as the object sighted. The principle of the device is 
ft 

Fic. 6.—Mirror right-angle finder. 
that the reflected object is first imaged through the open side of 
the box in the mirror opposite the sight opening through which 
the observer is looking and then reflected across from one mirror 
to the other, and thus brought into his vision. 
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