Match the following in context of the parts of prismatic compass.

a.

Graduation circle

1.

To damp the oscillation of the needle before taking a reading and to bring it to rest quickly the light

b.

Prism

2.

An aluminium graduated ring marked with 0 degrees to 360 degrees to measure all possible bearing of lines

c.

Object vane

3.

Used to read graduation on the ring and to take an exact reading by compass

d.

Spring break

4.

Carrying horsehair or black thin wire to sight the object in line with the object sight

a - 2, b - 3, c - 4, d - 1

a - 2, b - 3, c - 1, d - 4

a - 3, b - 2, c - 4, d - 1

a - 2, b - 4, c - 3, d - 1

a.	Graduation circle	1.	To damp the oscillation of the needle before taking a reading and to bring it to rest quickly the light
b.	Prism	2.	An aluminium graduated ring marked with 0 degrees to 360 degrees to measure all possible bearing of lines
c.	Object vane	3.	Used to read graduation on the ring and to take an exact reading by compass
d.	Spring break	4.	Carrying horsehair or black thin wire to sight the object in line with the object sight