Figurt ¡47. Clock tytiem.
It x V = 3 x 10 = 1.2 clicks, rounded off 25 to lh<? nearest whole number = ] click.
A graphic diagram for determining windage corrections is found in figure 148. b. Mirage.
Ml The word "mirage" refers to ihe heat wave»or reflection of light through layers of air of different temperature and density as seen by the naked eye on a warm, bright day. With the telescope, a mirage can be seen on all but the coldest days. Proper reading of mirages will ewjbW the firer to estimate and make windage corrections with a high degree of accuracy.
121 As observed through the telescope, the mirage will appear to move with the same velocity as the effective wind, except when blowing straight into or away from the scope. Then the mirage will give the appearance of moving straight up with no lateral movement. This is termed a "Boiling" mirage. In general, changes in the velocity of the wind can readily be determined by observation of the mirage up to speeds of approximately 19 kmpb. Beyond that speed, the movement of the mirage is too fast for detection of minor variations.
CIRCLES REPRESENT WIND VELOCITY IN KILOMETERS PER HOUR ( AS INDICATED IN TNE VERTICAL COLUMN. ROMAN NUMERALS INDICATE WIND DIRECTION. ARABIC NUMERALS INDICATE CLICKS OF WINDAGE. AS FOUND ON REAR SIGHT OF Jg^M 14 RIFLE.
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