• Fresnel's Basic Lens Designs
• Lens Orders
• Variations on a Theme
• Doubly Reflecting Prisms

Augustin Fresnel

First Flashing Lens
1823

First Fixed Lens
1824

First Fixed-Flashing
1825

First Catadioptric Lens
1826

 RADIUS mm.
1330 mm.
1125 mm.|
920 mm.
700 mm.
500 mm.
375 mm.
250 mm.
187.5 mm.
150 mm.
100 mm.
75 mm.

 

RADIUS inches
52.3 inches.
44.2 inches.
 36.2 inches.
27.6 inches.
19.7 inches.
14.7 inches.
9.8 inches.
7.4 inches.
5.9 inches.
4.0 inches.
2.9 inches.

 

The Eight-Order lenses were used almost exclusively in Scotland. In America, the Seventh-Order lenses were called Steamer Lens Lanterns..

FIRST ORDER

SECOND ORDER

THIRD ORDER

THIRD and ONE-HALF ORDER

FOURTH ORDER

FIFTH ORDER

SIXTH ORDER

VARIATIONS

DOUBLY REFLECTING PRISMS