Foif J2-2, Инструкция по эксплуатации

Страница: 15 / 28

15
until vertical circle reading remains constant.
3. Sighting
3.1 Focusing
Point telescope to sky or an uniformly light surface. Turn eyepiece (10) until cross
hairs are sharp and black. The dioptric scale now indicates the correct setting for the
observer’s eye. Note reading for future setting. Slacken horizontal and vertical
clamps. Point telescope to target by means of optical sight. Tighten clamps. Look
through telescope eyepiece and turn focusing sleeve (11) until target is seen. Set
cross hairs close to target by turning sleeve until target image is sharp and free from
parallax. If there is parallax remove by adjusting the focusing slightly. During
observation, no further focusing is allowed.
4. Circle reading
Both the horizontal circle and vertical circle are read in the microscope. The
change-over knob is used to select the required circle. Turn the change-over knob
(24) clockwise to its stop, the horizontal circle is read, anticlockwise, the vertical
circle. In the left window is the micrometer scale. Turn the eyepiece (9) of
microscope until the reading is sharp and black.