Per-cus′sionta′ble.
（Metallurgy.) A form of oreseparating apparatus consisting of a slightly sloping table on which stamped ore or metalliferous sand is placed to be sorted by gravity. A stream of water is directed over the ore, and the table is subjected to the concussion at intervals. The French apparatus (table d secousses) is like the rack used in the tin-works of Cornwall. The comminuted ore is brought upon the swinging table by a thin sheet of water, and, being spread in a state of mechanical suspension in the liquid, is caused to arrange itself to some extent by gravity, as the heavier grades will sink the sooner while the lighter pass to a greater distance down the inclined table. The latter is suspended in such manner as to receive a double motion, horizontally and vertically, the latter being accompanied by a jar, as the table drops upon two wooden stops.
