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Handbook: 197 of 287
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TABLE OF LUXFER PRISM PRESCRIPTIONS.
HIGHEST LIGHT 25° BELOW HORIZONTAL.
| Zenith- |
Inclination of Lowest Light Below Horizontal. |
| tangent |
|
20° | | |
25° | | |
30° | | |
35° | | |
40° | | |
45° | | |
| .50 |
A | |
A | |
A | |
A | |
A | |
A | |
| .60 |
A | |
A | |
A | |
A | |
A | |
A | |
| .70 |
L | |
L | |
L | |
L | |
L | K |
L | J |
| .80 |
L | |
L | |
L | |
L | |
L | K |
L | J |
| .90 |
K | |
K | |
K | |
K | |
K | |
K | J |
| 1.00 |
K | |
K | |
K | |
K | |
K | |
K | J |
| 1.10 |
J | |
J | |
J | |
J | |
J | |
J | |
| 1.15 |
J | |
J | |
J | |
J | |
J | |
J | |
| 1.20 |
J | |
J | |
J | |
J | |
J | |
J | |
| 1.25 |
J | |
J | |
J | |
J | |
J | |
J | |
| 1.30 |
J | |
J | |
J | |
J | |
J | |
J | |
| 1.35 |
J | |
J | |
J | |
J | |
J | |
J | |
| 1.40 |
J | |
J | |
J | |
J | |
J | |
J | |
| 1.50 |
J | |
J | |
J | |
J | |
J | |
J | |
| 1.60 |
J | |
J | |
J | |
J | |
J | |
J | |
| 1.70 |
J | |
J | |
J | |
J | |
J | |
J | |
| 1.80 |
J | |
J | |
J | |
J | |
J | |
J | |
| 1.90 |
J | |
J | |
J | |
J | |
J | |
J | |
| 2.00 |
J | |
J | |
J | |
J | |
J | |
J | |
| 2.25 |
J | |
J | |
J | |
J | |
J | |
J | |
| 2.50 |
J | |
J | |
J | |
J | |
J | |
J | |
| 2.75 |
J | |
J | |
J | |
J | |
J | |
J | |
| 3.00 |
J | |
J | |
J | |
J | |
J | |
J | |
| 3.50 |
J | |
J | |
J | |
J | |
J | |
J | |
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