Three-Arm Protractor
Product Description
Specifications
1.High accurancy.
2.Good quality with reasonable price.
3.Fast delivery with good afterservice.
Three-Arm Protractor :
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.
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.