central chain and were pulled along on a wrought iron bar,
which could be renewed when necessary. These conveyors with a speed of
48 ft. per minute, had a capacity of some 20 tons per hour. A conveyor
constructed on these lines was installed at the Gathorn works in 1903.
The wear and tear was very great; moreover the chain, being central,
suffered severely from the hot coke, to the action of which it was
directly exposed.

The New Conveyor Company's conveyor consists of a water-tight trough
through which pass closely-fitting tray plates, attached to a single
chain. These plates are joggled down at one end to receive the flat
front part of the succeeding plate, with the aim of excluding the
breeze from the under part of the carrying plate. The chain is made
entirely of steel with side rollers attached to every third plate, the
plates, 1/4 in. thick, are dished in the shape of a tray, which is less
liable to distortion (from heat) than a flat plate. The speed of
travel is about 45 ft. per minute, while the capacity when handling
coke from 20 ft. retorts is some 30 tons per hour.

A conveyor made by Messrs Graham, Morton & Co., consists of a
travelling tray, the sections of which are joined together by steel
spindles provided with a roller at each end, the latter running on
suitable rails. These sections consist of steel castings with a number
of lateral slots; thus the tray has the appearance of a travelling
grating. To receive the quenching water that escapes through the
grating a trough is placed beneath, and a scraper is used to free the
trough of the dust escaping through the grating.

[Illustration: FIG. 11.--Bronder Hot Coke Conveyor.]

An interesting conveyor is that of G. A. Bronder, of New York (fig.
11), which has some affinity with the gravity bucket conveyor. It runs
in a water-tight trough which is filled up to a certain height, the
water being slowly circulated by mechanism which resembles a water
wheel. The chain of buckets runs in the trough, the sides forming the
rails for the supporting rollers. The conveyor is covered in along its
whole length, and forms a sort of flue which is connected at each
bench with a number of shoots through which the coke drops into the
conveyor buckets. A pipe of large diameter is connected with an
exhaust fan, which draws away the fumes created by the quenching
process, and sends them into a chimney d