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144 Chapter Seven
Figure 7.27 Erecting prisms: (a) Schmidt prism; (b) Leman (or Sprenger)
prism; (c) Goerz prism; (d) modified Amici prism; (e) roofed Pechan prism;
(f) roofed delta prism.
7.12 Inversion Prisms
The Dove prism (Figs. 7.19 and 7.20) and the roofless Abbe prism
mentioned in Sec. 7.11 are examples of prisms which invert the image
in one meridian but not the other. The plane mirror and the right-
angle prism (Figs. 7.11 and 7.16) are also simple inversion systems.
Figure 7.28 shows the above prisms plus the Pechan prism, which is a
