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The Diagonal Opera Glass

By the diagonal position of a plane mirror, a curious opera-glass is
constructed, by which any person may be viewed in a theatre or public
company without knowing it. It consists only in placing a concave
glass near the plane mirror, in the end of a short round tube, and a
convex glass in a hole in the side of the tube, then holding the end
of the tube with the glass to the eye, all objects next to the hole in
the side will be reflected so as to appear in a direct line forward,
or in a position at right angles to the person's situation who is
looked at. Plane glasses, instead of a convex and concave, may be
used; in this case the size of the object will not be increased, but
it will appear brighter.

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