TM 5-6675-322-14
(3) Make elevation reading (4-6.2e). Micrometer reads 3.98 mm.
(4) Subtract readings. Difference is 0.60 mm. Reading is increased so sign
i s + ( p l u s ).
( 5 ) M e a s u r e d i s t a n c e ( p r i n c i p l e p o i n t s e p a r a t i o n ) . D i s t a n c e i s 7 6 . 2 m m .
(6) Height of aircraft was 5000 ft above sea level.
Example (2): Using same photographs, determine height of
building.
1.
Make datum reading at base of building. Reading is 4.28
mm.
2 . M a k e e l e v a t i o n r e a d i n g a t t o p o f b u i l d i n g . R e a d i n g is
4.58 mm.
4-13
