FUSAROLE, or FUSAROL, in archi tecture, a molding or ornament placed immediately under the echinus in the Doric, Ionic, and Composite capitals; the shaft of a column, pilaster, or pillar, or that part comprehended between the shaft and the capital.
FUSE (a shortened form of fusee), a tube or casing filled with combustible material, and used for igniting a charge in a mine or a hollow projectile. The in vention was undoubtedly contemporane ous with that of hollow projectiles. The following are the principal varieties of fuses in use: (1) Bickford fuse, used for mining and submarine purposes. It consists of a small linen tube filled with gunpowder, the whole being covered with pitch. It burns at the rate of one yard in 70 sec onds.
(2) Blasting fuse, used in mining and quarrying. It is filled with a slow-burn ing composition, allowing time for the operatives to reach a place of safety be fore it burns down to the charge. It is also used for submarine blasting.
(3) Combination fuse, for hollow pro jectiles, comprises a time-fuse and a per cussion or concussion fuse united in the same case. The former is designed to explode the charge in case the latter fails to act on striking. Another form is that in which the time-fuse explodes the percussion-fuse. The variety is used
with such explosives as dynamite and gun cotton.
(4) Concussion fuse, for Lollow pro jectiles; designed to explode the charge when the shell strikes an object.
(5) Delayed action fuse, for use with common shell against earthworks. It causes the projectile to explode four sec onds after impact.
(6) Electric fuse is one adapted to be ignited by the passage of an electric spark through it.
(7) Percussion fuse, embraces a cap sule charged with fulminate, which is exploded by a plunger or its equivalent, when the projectile strikes. The plung er is held by a pin sufficiently strong to keep it in place in case of a fall, yet weak enough to be severed by the shock of striking.
(8) Safety fuse is a cord or ribbon shaped fuse filled with a fulminating or quick-burning composition, and suffi ciently long to be ignited at a safe dis tance from the chamber where the charge is placed.
(9) Tape fuse is a safety fuse, so called from its shape.
(10) Time-fuse is one which is adapt ed either by cutting off a portion of its length or by the character of its com position to burn a certain definite time.