CONTENTS. xi
The Names of the various Sorts of Polygons - - - Page 50
What the Sections of a Cone produces - - - 51
A Circle and an Oval the only regular Surfaces bounded by one Line—the Deriva-
tion of the Term Ellipfis - - - - ibid.
SECT. IV.
Of drawing various ufeful Geometrical Figures - - " 52
Problem 5. To draw a Geometrical Square - - 53
— - 6. To draw a Rhomb - ibid.
.— -- 7. To draw Polygons - * - 55
■--— 8. To defcribe a Hexagon - - - " 5&
——— 9. To defcribe a Heptagon - ibid.
-- 10. A Circle given to find the Sides of a Pentagon - - ~ 57
————11. The Infcription of a Hexagon - - - - 58
-—-*12. Different Methods of drawing Ovals - - 59
---— 13. Ditto - - - - - - 60
-—— 14. Ditto - - - - - -61
•- 15. Ditto - - - - - - 62
16. Ditto - - - - - 63
- 17. Ditto - - - - 65
--- 18. To find the Center and Diameter of an Oval - - 66
-- 19. To find the Center of any Segment - - - 67
——— 20, To find the Diameter of a Cylinder without meafuring its End - 69
SECT.- V. Problems pertaining to the Working Part.
21. The extreme Lines are given to find any Number of mean Proportionals 7 1
Illuftration of this - - - 7 2
How to cut all the Steps of a Ladder to their proper Length before any
Part of it is put together - - - - 7 3
b 2 Problem