Details of Jenkins night altitude indicator. German types similar in principle.
An optical altitude indicator for night landing
U. S. Nat. Advisory Committee Aeronautics, Technical Notes
1923
5 pages
3 Figs.
Report
English
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An Optical Altitude Indicator for Night Landing
NTRS | 1923
|An optical altitude indicator for night landing
SLUB | 1923
|Engineering Index Backfile | 1928
NTRS | 1984
|