SPIRAL a.
iral gearing, a kind of gearing sometimes used in light machinery, in which spiral gears, instead of bevel gears, are used to transmit motion between shafts that are not parallel. -- Spiral operculum, an operculum whih has spiral lines of growth. -- Spiral shell, any shell in which the whorls form a spiral or helix.…
STAFF n.
od at the bottom, for penetrating the ground, and having a socket joint at the top, used, instead of a tripod, for supporting a compass. -- Staff angle (Arch.), a square rod of wood standing flush with the wall on each of its sides, at the external angles of plastering, to prevent their being damaged. -- The staff of…