Differences between prismatic and surveyors compass
Sr. No.
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Prismatic Compass
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Surveyors Compass
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1.
2.
3.
4.
5.
6.
7.
8.
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Graduation circle is fixed to broad type
needle. HenceThere is a prism at viewing end.it will not rotate with the line
of sight.
There is a prism at viewing end.
Sighting and reading can be done
simultaneously.
The magnetic needle do not act as an index.
The graduations are in whole circle
bearing.
Graduations are marked inverted since its
reflection is read through prism.
The reading is taken through a prism.
Tripod may or may not be used. It can be
held
on a stretched hand also.
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Graduation circle is fixed to the box.
Hence, it
rotates with the line of sight.
At viewing end there is no prism. There is
only
a slit.
Sighting and viewing cannot be done
Simultaneously
Magnetic needle acts as index while reading
The graduations are in quadrantal system.
Graduations are marked directly. They are
not
inverted.
The reading is taken by directly viewing
from
top glass.
Tripod is essential for using it.
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