Major parts of compass
(1) compass box
It is a cylindrical metal box of about 8 cm to 12 cm diameter
(2) Pivot
(3) Magenetic needle
In prismatic compass - The needle does not act as an index. And needle is of broad type
In surveyor compass- The needle acts as an index . And edges bar type.
(4) Graduated ring
In prismatic compass - (i) The graduated ring is attached to the needle.
(ii) The graduated ring does not rotate along with the line of sight.
(iii) The graduations are in whole circle bearing system
(iv) 0° at south ,90° at west ,180° at north and 270° at east.
(v) The graduations are engraved inverted.
In surveyor compass- (i) The graduated ring is attached to the circular box.
(ii) The graduated ring rotate along with the line of sight.
(iii) The graduations are in quadrantal system
(iv) 0° at north and south and 90° at east and west ,
(v) The graduations are engraved erect.
(5) Agate Cap
(6) Glass Cover
(7) Prism
(8) Prism Cap
(9) Sighting silt
(10) Coloured glasses
(11) Focussing Screw
(12) Object Vane
(13) Horse hair
(14) Reflecting mirror
(15) Brake pin
(16) Spring brake
(17) Lifting pin
(18) Lifting lever
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What is surveying ?...............
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