Sheraton, Thomas; Bensley, Thomas; Mathews, James; Bensley, Thomas [Oth.]; Mathews, James [Oth.]; Terry, George [Oth.]; Jordan, Jeremiah Samuel [Oth.]; Wayland, L. [Oth.]: The Cabinet-Maker And Upholsterer's Drawing-Book: In Three Parts (London: Printed For The Author, By T. Bensley; And Sold By J. Mathews ... C. Terry ... J.S. Jordan ... L. Wayland ... And By The Author, 1793)

fome curved ones* Three of thefe are equilateral, or equal-
Jided, if meafured by a right line; and No. 14 is a fcalene tri-
angle by the fame rule, as none of its fides are equal. The
fides of thefe mixed triangles that are round, are called convex
but thofe that are hollow, as No. 13, 14, are called concave.
Of Spherical t 'Triangles.
A fpherical triangle is one that is curved on every fide, as
No. 15 and 16. Thefe are both of the equilateral kind, becaufe
their fides may be bounded by right lines of equal length.
Of Mixtilineal Figures.
No. 17, is of this kind; and every other figure that is
bounded both by right and curved lines is called mixtilineal.
Of thefe figures fome are regular, and fome irregular.
When a figure of this kind is compofed of equal curved
and equal right lines, then it is called a regular compound mix-
* Convex is properly applicable only to any folid that has a curved or fwelled furface,
and concave is the contrary.
t Spherical, fomething like a fphere or globe.

tilineal