The woodcut in Fig. 1 comes from a late 19th-century French book on the wonders of science. In it a girl is using the reflection from a transparent glass surface to copy a picture.

1.
Gaston
Tissandier
,
Les Récreations Scientifiques ou L’Enseignement par les Jeux
, 2nd ed. (
G. Masson
,
Paris
, ca.
1875
), p.
137
.
2.
Merritt W.
Green
 III
and
Thomas B.
Greenslade
 Jr.
, “
Experiments with stereoscopic images
,”
Phys. Teach.
11
,
215
221
(
April
1973
).
3.
Thomas B.
Greenslade
 Jr.
, “
19th Century Textbook Illustrations XVI: Illusions with unsilvered mirrors
,”
Phys. Teach.
15
,
360
361
(
Sept.
1977
).
4.
Adolf F.
Weinhold
,
Introduction to Experimental Physics
, edited by
Benjamin
Lowey
(
Longmans Green and Co.
,
London
,
1875
), pp.
437
537
.
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