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them against lighting by the sunrays and serve for decreasing detrimental (diffused)
light, which penetrates in the device.
The tripod (Fig.6) is designed for mounting the device on this ground or any
immovable base.
The mechanism of the vertical laying consists of outer bracket, its box embodies
gearing train, gears and limb with the scale of angles of elevation. The mechanism of
horizontal 6 laying performs horizontal laying of the device with the help of handles
which are also used for vertical laying.
The round spherical level 6 (Fig. 2) serves for levelling the device.
It consists of vial and casing. The vial is filled with ethyl alcohol. Three concentric
circumferences are marked on its outer surface; they are used for determination of the
device levelling accuracy. The level division value is 0-02.
7
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