| |
|
|
|
| |
| |
| |
|
| |
|
Constructed by Samuel Morland (1625-1695) in 1663 of silvered brass and silver, the Machina Cyclologica Trigonometrica has geared scales which can pivot or shift around a central point to form several positions. Both the scales and the arms of graduated protractors can be arranged to form a triangle, the sides and angles of which can be measured. Two small gauges have indicators which also move. As an added refinement, the device can be set to work as a sector, and in this way multiplication and division are performed graphically. |
| |
|
|
|
|
