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 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 presented to the left eye is used as a finder, the
See also:lower portion is occupied by the scale upon which the ranges are engraved . The finder is a low-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 black
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 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 DOW uFPORT /IMDER
See also:GLASS SUIMORT WINDOW RE n
See also:artillery ranges, it is IRATE WIN )
See also:FRAME EYE PIECE PRIS5S-W SCALE ass desirable to use a ccro OBJECT GLASS CASE >rZn 'redouble
See also:base (1oo yds .
TANNEGUY LEFEBVRE (TANAQUILLUS FABER) (1615-1672)
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