A treatise on surveying, comprising the theory and the practice (1906)
Gillespie, William Mitchell, 1816-1868, Staley, Cady, 1840- · New York D. Appleton · leaf 395
S E S = a + a = 2fl = 2SEH When the sun is the object observed, to determine whether itis his upper or lower limb whose altitude has been observed, pro-ceed thus: Having brought two limbs to touch, push the index arm fromyou. If one image passes over the other, so that the other two 38i MARITIME OR… … Fig. 550. parting, and the upper limbs are approaching; and vice versa mthe afternoon. To observe very small altitudes and depressions with the artifi-cial horizon: Stretch a string over the artificial horizon. Place your head sothat you see the string cover its image in the mercury. Then the eye…
Surveying
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