| If one imagines a square with four quadrants, the top left-hand quadrant is the case where there is a simple breach of confidentiality. |
| Cables or chains run round a quadrant attached to the top of the rudder shaft. |
| Right at the stern the steering quadrant is intact and still attached to the rudder shaft. |
| At the top is the steering quadrant, while at the bottom the rudder lies flat against the seabed. |
| Another early navigational instrument that relied on the same principles as the quadrant was the mariner's astrolabe. |
| In 1730 he invented a quadrant which measured the altitude of the Sun or of a star. |
