FRU

436

FU S

3.5

2.25

1.25 difference of the two bases.1.25

625

250

125

3 ) 1.5625 sq. of the difference of the two bases..5208

2.25

3.5

1125

675

7.875

Add .5208 being of the squ. of the difference.

8.3958

8.75

419790

587706

671664

I I

73.463250 the solidity required.

To measure the frustum of a cone.

To the rectangle of the two diameters, add one-third ofthe square of their difference: multiply the sum by .7854,and the product by the length.

Example. —What is the solidity of the frustum of a cone,the diameter of the greater end being 3 feet, that of thelesser end being 2 feet, and the altitude 9 feet ?

1 difference of the diameters.

1

1 sq. of the difference of the diameters.

Sum 6^

.7854

47124

2618

4.9742

9 the length.

44.7678 the solidity of the frustum-

, i e ver 10

FULCRUM, in mechanics, that by which asustained. n9 fot

FUMARIUM, an upper room used by thecollecting the smoke from the lower ones. The * ^

was chiefly used, however, for smoking or ripening v t!l jne<lFUNNEL, that part of a chimney which is S&between the fire-place and the summit of the sChimney .

FURCATED, having a forked appearance. . of 0

FURLONG, a measure of length, the eighth Pmile, forty poles. . . ff itb

FURNITURE, the fastenings of doors and windo .brass knobs, &c. . , gr g in

FURRING, when the edges of any number of p 0 i'in>a range are out of the surface they were intended jgjpiileither from their gravity, or in consequence of ,Z 0 n |iindeficiency of the timbers in their depth ; thescantlings or laths upon the edges, so as to form that j eV -elis called furring. Thus the timbers of a floor, th°Uc^ at j 0 nat first, are often obliged to be furred: in the rfP e ja'of old roofs, the rafters have mostly to undergo this ^ 0l - 3 ,tion: and the ceiling joists, both of new and °frequently require it. . hr ;agin?

FURRINGS, the pieces of timber employed in ^any piece of work in carpentry to a regular surf® 6 ofthe work is deficient through the sagging of the tunother causes.

FUR-UP. See Furring. r

FUST, (from the French ) the shaft of a column,of a pilaster. j n go® e

Fust, a term used in Devonshire, and perhapsother counties, for the ridge of a house. is wo0“'

FUSTIC, sometimes called Yellow Wood. ^. gg; an"

the Morus linctoria, is a native of the Westaffords much colouring - matter, which is ver 7 P is d®The yellow given by fustic without any mordan^ j 0 y e dand brownish, but stands well. The mordants ^ b/with weld, act upon fustic in a similar mannetheir means the colours are rendered more brig' 1 et _vvonThe wood of this tree is also used in mosaic caand turnery. . n a ge® 1 '"

FUSUROLE, or Fusarole, (from the Lat ‘ nj UI1 der tbecircular member cut into beads, generally placeechinus of the Ionic and Roman capitals.