The most usual method is by wheelbarrows called technically "brouette a barque" (Fig. 201). They are made in wood and iron, and can carry fifty bricks each. When the drying-places are in storeys, lifts are used similar to those which we have described in speaking of the transport of bricks from the machine to the drying-sheds. The use of waggons necessitates a special installation, only possible with kilns of a certain size where space allows of some freedom of movement. The following is an arrangement which ensures an easy delivery, and avoids the use of turn-tables; the working of the latter is always slow, and has the inconvenience of injuring the goods through the shocks and jolts produced.
On each side of the kiln, and in the direction of its length, two trenches are dug, and in them is laid a railway to carry a transfer trolley (Fig. 182). This trolley carries a single, or preferably a double, line of rails of half-a-metre gauge placed perpendicular to the first. The half-metre rails correspond to other lines which join each door of the kiln to the transfer trolley.
These lines are fixed and continue into the kiln by means of movable branches which are laid in the direction of the place of stacking and afterwards removed.
The working is simple: the Waggons, when they arrive from the outside drying-sheds, or are lowered by a lift from the upper storeys, are placed on the trolley, the rails of which have been put in line with those serving the drying-places; the trolley is pushed in front of the line corresponding to the compartment to be filled, and fixed by means of a bolt, then the waggon full of bricks is passed into the kiln. Near the door there is a curved branch leading to a line which ends with a turn-table. When the waggon reaches this turn-table it is turned round so that the brick-stacker may more conveniently take the bricks from it. Meanwhile the waggon-man has pushed out the empty waggon which was on the other turn-table, and which now goes on to the trolley in place of the one just sent inside. The trolley is unbolted, and it is taken to fetch another waggon which a second Workman has loaded. A skilful stacker can fill a compartment containing from 12,000 to 15,000 bricks in ten hours. Everything is brought to him, the bricks and also the sand which is placed between the layers to prevent them from sticking together. While he is working, the waggon-men, who have time to spare, close the doors up with a wall 2 1/3 inches thick, formed of bricks on edge and coated with clay. This wall is placed against the stacked bricks. Then a foot away they build another wall of bare bricks and of thickness equal to a brick's length; between they heap up clay (Fig. 212) to avoid any entrance of air which would interfere with the draught.
Fig. 223. Installation for Charging and Discharging.
The good firing of the neighbouring bricks and the satisfactory progress of the fire depend upon the care with which a door is closed. From time to time the stoker looks round to see that no air is getting in by the doors; this would be shown by a whistling sound, and should it occur it is remedied by heaping clay up at the top of the door.