run in the corners of the trough, the two
chains being connected together by round cross bars set 30 in. apart,
so as to form a sort of ladder. The hot coke is carried or dragged
along by these bars. One end of the trough is closed and the other is
bent upwards with a view to retaining the quenching water. As the hot
coke is dragged along it is subjected to the action of jets of water.
The conveyor bars, which act as scrapers, sweep the water and the coke
along the trough till the point is reached where the latter curves
upwards. Then the water flows back like a small cascade on the
half-quenched coke, which is thus thoroughly extinguished.
Considerable inclines can be negotiated with this conveyor; in some
installations on the continent of Europe angles of 30 deg. to the
horizontal have been surmounted. In a modification of the De Brouwer
conveyor, installed at the Cassel gas works, the bars which form the
rungs of the conveyor were replaced by cast iron rakes. In another
modified form, the work of F. A. Marshall, to be found in the
Copenhagen gas works, sluices are provided for withdrawing an excess
of water at any point in the trough.

In Great Britain a hot coke conveyor has been designed on similar
lines by Messrs R. Dempster & Sons, Ltd. (fig. 13). The chains are
parallel from end to end, and are composed of identical and
interchangeable malleable cast links. Instead of the chains carrying
the rollers, as is often the case, the chains are themselves carried
and guided by flanged rollers supported from the framework. This
arrangement has the advantage of decreasing the weight of the chain,
as neither the rollers nor the lubricators have to be conveyed, being
stationary. The scrapers are of cast steel and have a rake-like shape
with a view to minimize the breakage of coke.

[Illustration: FIG. 13.--Dempster Coke Conveyor.]

The essential features in a hot coke conveyor are strength and
simplicity, a minimum of wearing parts, interchangeability of wearing
surfaces and of worn and broken parts, protection of wearing and working
parts from contact with the hot coke, and facilities for keeping the
temperature of the conveyor as even as possible, so as to avoid
distortion of parts through sudden changes. To attain these latter
conditions, it appears essential to construct conveyors of the pushplate
type. In these the hot coke is kept continually moving, and thus th