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Three-Arm Protractor
Specifications：
1. Diameter of the graduated circle:126.85mm
2. Arm length:340mm
3. length of connecting arm:290mm
4. total length of the pointing arm:630mm
5. minimal reading number:1min
6. differential drum type.
The description/sizes may be different with goods, please check with us when order.
Application:
The three-arm protractor cooperates with a sextant to measure the ship is position by either threepoint-two-angle method or angle-between-objeetive-plus-bearings method.
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