De quoi est fait Quadrant de Davis
An angle gauge that let the navigator avoid looking at the Sun.
- Small arc scale — a pour partie. A scale for large angles.
- Large arc scale — a pour partie. A scale for small angles.
- Shadow vane — a pour partie. It casts the Sun’s shadow onto the slit.
- Trigonometry — utilise. The Sun’s altitude is found from the angle of a shadow.
- Wood — est fait de. The Davis quadrant is wooden.