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Encyclopedia Britannica



LEFT

This article appears in Volume V22, Page 889 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: LAP-LEO
LEFT SEARING
A
rubber
  guard is fitted round the eye-pieces. Its functions are to guide the eyes of the observer into the correct position, and to protect them from side light and the distressing effect of wind. It also
guards
  the forehead against the jar occasioned by firing heavy guns. The upper portion of the field presented to the left eye is used as a finder, the lower portion is occupied by the scale upon which the ranges are engraved. The finder is a low-power
telescope
  of large field, to the centre of which the 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 black
horizontal
  line. When coincidence of the images is effected by means of the working head, the range can be
2 The length of tube varies from 3 ft. in the smaller to 9 ft. in the larger
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 night use, means are provided for
illuminating
  the scale. The range recorded-range must result. The
instruments
  are expected to give an to lights may be ascertained by the use of the astigmatizer, an optical accuracy of less than
device by which a point of light is
drawn
  out into a
vertical
  streak. 2 % at 2000 yds. For A*,ogjectioe
A beam of light from the objective falls on each reflector (fig. 2), ranges over that distance, i.e. for usual
DOW uFPORT /IMDER
OBJECT
  GLASS SUIMORT WINDOW
RE n artillery ranges, it is
IRATE
WIN )
FRAME
  EYE PIECE PRIS5S-W SCALE ass desirable to use a
ccro
OBJECT
  GLASS CASE >rZn 'redouble base (1oo yds.


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