|
|||||||
Brown - figure 406 |
|||||||
---|---|---|---|---|---|---|---|
Click to enlarge |
Description
Mechanical means of describing parabolas, the base, altitude, focus, and directrix being given. Lay straight edge with near side coinciding with directrix, and square with stock against the same, so that the blade is parallel with the axis, and proceed with pencil in bight of thread, as in the preceding. |
||||||
Linked items | |||||||
|
|||||||
Permanent links | |||||||
|
|||||||
Data provider | |||||||
|