Difference between Prismatic compass and surveyor compass

Prismatic Compass

1. The needle is of broad type

2. The dia of box varies from 85 mm to 100mm

Prismatic compass

3. It is graduated in WCB system

4. The reading is taken by prism.

5. The tripod may or may not be required

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6. Sighting & reading can be done

simultaneously from single position

of instrument.

7. It is engrained inverted.

Surveyor's Compass

1. The needle is of Edge bar type

2. The dia of box varies from 115mm to 200mm

Surveyor compass

3. It is graduated in Q.B. system.

4. The reading is taken by prism top of glass.

5. The tripod must be required

6. Sighting & reading cannot be done simultaneously from single position of instrument

7. it is engrained erect.

Note:-

 prismatic compass s more preferred over surveyor compass because by prismatic compass, Sighting & reading can be done simultaneously from single position of instrument