Functions
of clamp and tangent screws.
1)
Clamp screws:
When the upper clamp screw is tightened and lower clamp screw is loose, the
instrument rotates about outer axis, without any relative motion between
plates. The vernier reading do not change.
When lower
clamp screw is tightened, but the upper clamp screw is loose, the instrument
rotates about the inner axis with a relative motion between the tow plates. The
vernier reading changes.
If both the clamp screw are
tightened instrument cannot rotate at all.
2)
Tangent
screws for small movement ofplates or for accurate fixing ofplates
corresponding tangent screw (corresponding to plates) are used. Permanent
adjustment of theodolite:
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