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Updated: May 25, 2025
Every single joint must be perfectly made with fireclay cement or paste. The fireclay bricks, &c., must be selected with regard to the amount of indestructible silica in the clay, consistent with hardness and toughness. Homogeneity of material must be obtained, having regard to expansion and contraction.
"Will no doubt cut down the timber, open the fireclay pits, and desecrate the park with brickworks," he said. "That is, unless he has convivial proclivities, and, finding himself ostracized, fills Carnaby with turf and billiard-room blacklegs." The girl ground her heel viciously into the mould. "Have you any reason for going into these details?" she said. Deringham watched her closely.
Unreadiness is a great vice in the Turkish bath appended to these institutions. Hot rooms beneath their proper temperature, and lukewarm water, are unpardonable delinquencies, either in the early morning, in the evening, or during the day. For this reason I would recommend a furnace of fireclay, as it retains its heat for a long time, and is not subject to the rapid changes of iron stoves.
The advantage of such a furnace as that shown is that it supplies radiant heat of a most exhilarating kind, besides a proportion of heated air, and from a fireclay surface, the employment of which renders it absolutely impossible to overheat the air, or to contaminate it by deleterious particles resulting from the decomposition of metal.
A temperature that will make steel run like water and melt down fireclay has absolutely no effect upon it. You may put a piece of platinum wire no thicker than human hair into a blast furnace where ingots of steel are melting down all around it, and the bit of wire will come out as absolutely unchanged as if it had been in an ice box all the time.
The principle is applied in the following manner: A cylinder of fireclay slides in a metal tube, and has two platinum wires one one-hundredth of an inch in diameter wound round it in separate grooves. Their ends are connected at the top to two conductors, which pass down inside the tube and end in a fireclay plug at the bottom.
Here the pyrometer itself consists of a set of tubes one inside the other, and all inclosed for safety in a large tube of fireclay. The central tube or pipe brings in the water from a tank above, where it is maintained at a constant level. This tube projects from the fireclay casing into the medium to be examined, and can be pushed in or out as required.
In this way the relative dilatation of the graphite is sufficiently magnified to be easily visible. A somewhat similar instrument is the Gauntlett pyrometer, which is largely used in the north of England. Here the instrument is partly of iron, partly of fireclay, and the difference in the expansion of the two materials is caused to act by a system of springs upon a needle revolving upon a dial.
The illustration shows a simple furnace; but it would be an easy matter to improve upon this by providing iron air-tight doors lined with fireclay, for cleansing flues and air-chambers. The example given is only suited to heat a small public bath.
To return to the bricks in the London market: we have firebricks made of fireclay, and almost vitrified and capable of standing intense heat. These are used for lining furnaces, ovens, flues, etc. Then we have almost, if not quite, as refractory a material in Staffordshire blue bricks, used in various forms for paving channels, jambs of archways, etc.
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