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LEFT SEARING
A See also:rubber guard is fitted See also:round the See also:eye-pieces. Its functions are to See also:guide the eyes of the observer into the correct position, and to protect them from See also:side See also:light and the distressing effect of See also:wind. It also See also:guards the forehead against the See also:jar occasioned by firing heavy guns. The upper portion of the See also:- FIELD (a word common to many West German languages, cf. Ger. Feld, Dutch veld, possibly cognate with O.E. f olde, the earth, and ultimately with root of the Gr. irAaror, broad)
- FIELD, CYRUS WEST (1819-1892)
- FIELD, DAVID DUDLEY (18o5-1894)
- FIELD, EUGENE (1850-1895)
- FIELD, FREDERICK (18o1—1885)
- FIELD, HENRY MARTYN (1822-1907)
- FIELD, JOHN (1782—1837)
- FIELD, MARSHALL (183 1906)
- FIELD, NATHAN (1587—1633)
- FIELD, STEPHEN JOHNSON (1816-1899)
- FIELD, WILLIAM VENTRIS FIELD, BARON (1813-1907)
field presented to the left eye is used as a finder, the See also:lower portion is occupied by the See also:scale upon which the ranges are engraved. The finder is a See also:low-See also:power See also:telescope of large field, to the centre of which the See also:objective is brought. When the telescope is thus correctly aligned, the objective will be seen with the right eye largely magnified, but as two partial images separated by a thin See also:black See also:horizontal See also:line. When coincidence of the images is effected by means of the working See also:head, the range can be
2 The length of See also:tube varies from 3 ft. in the smaller to 9 ft. in the larger See also:instruments.
i
read off against a pointer from the scale seen with the left eye. For 1 or on different parts of the same objective, and thus inaccuracy in the See also:night use, means are provided for See also:illuminating the scale. The range recorded-range must result. The instruments are expected to give an to See also:lights may be ascertained by the use of the astigmatizer, an See also:optical accuracy of less than
See also:device by which a point of light is See also:drawn out into a See also:vertical streak. 2 % at 2000 yds. For A*,ogjectioe
A See also:beam of light from the objective falls on each reflector (fig. 2), ranges over that distance, i.e. for usual
See also:DOW uFPORT /IMDER See also:OBJECT See also:GLASS SUIMORT WINDOW
RE n See also:artillery ranges, it is
IRATE
WIN ) See also:FRAME EYE PIECE PRIS5S-W SCALE See also:ass desirable to use a
ccro OBJECT GLASS See also:CASE >rZn 'redouble See also:base (1oo yds.
End of Article: LEFT
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