Sheraton, Thomas; Bensley, Thomas; Mathews, James; Bensley, Thomas [Bearb.]; Mathews, James [Bearb.]; Terry, George [Bearb.]; Jordan, Jeremiah Samuel [Bearb.]; Wayland, L. [Bearb.]: 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)

( HI )

perpendicular line from either No. i or 2 to No. 3 on each per-
pendicular as numbered, and drawing a curve line through
each point as before, it will produce an ellipfis for the outfide
fhape of each hip rib.
The next thing to be confidered, is the length required for
each rib, according to their diftance from each angle of the
dome. A little thought will make this eafily underftood; for
if No. 3 was placed in an upright pofition, being confidered as
a frame, and if the portion of the curve from n to 1 at No. 1
was placed upright to it, the two points 1 in No. i, and 1 in
v No. 3, would coincide, and the point 2 of No. 1 would coincide
with 2 at No. 3, and fo of all the reft. Hence, from n to 1 of
No. 1 is the length of the firft fhort rib, whofe plan is at a;
from n to 2 is the fecond fhort rib, whofe plan is at b; from
n to 3 is the third fhort rib; its plan at c : from n to 4 is the
fourth fhort rib; its plan at d: and from n to 5 is the fifth
fhort rib; its plan at e. The long ribs are taken from No. 2
in the fame manner; each of which has its plan laid down at
No. 3, as a b c d e f, fo that I need not fay any thing more on
this part of the fubjed. For the length of the hip ribs, take
from p to 5 at No. 3, and allow three-quarters of an inch for
dovetailing into the center block,
o
General