Typically, coke-oven gas is obtained from a battery comprising a number of narrow, vertical chambers, or ovens (0.5m wide, 5m high and 12m long) built of silica brick that are separated by heating ducts, such that heat is transmitted to the coal through both sides of the chamber walls.
ISO keyboard symbol for âControlâ. In computing, a Control key is a modifier key which, when pressed in conjunction with another key, performs a special operation (for example, +); similar to the Shift key, the Control key rarely performs any function when pressed by itself.
A key on PC keyboards labeled Ctrl. You use the Control key in the same way that you use the Shift key -- keeping it pressed down while pressing another character. The result is a control key combination, which can have different meanings depending on which program is running. On Macintoshes, the Control key is called an Apple key or Command key.