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Updated: May 7, 2025
The heating surface may be increased indefinitely by multiplying the number of tubes. If a solid fuel-coal, coke, charcoal, etc.-fire is used, the walls of the casing should be lined with asbestos or fire-clay to prevent the metal being burnt away.
The furnace itself should be of fire-clay, and so designed that its utmost heating power may be economically employed in warming the incoming air, which should pass over the furnace and iron flues, through the holes in partition wall, and thus into the hot rooms. The flue, if of wrought iron, should be rectangular in section, but if of cast-iron it should be round.
We would mine out the dirt, or fire-clay as it was called, from under the coal to the distance of two feet, or the length of a pick-handle, and to the depth of some six inches. We would then set our iron wedges in above the vein of coal, and with the sledge hammer would drive them in until the coal would drop down. Imagine my forlorn condition as I lay therein that small room.
"Of course, the problem presented no difficulty. There was a fire-clay furnace in the laboratory in which I had been accustomed to consume the bulky refuse of my preparations. A hundredweight or so of anthracite would turn the body into undistinguishable ash; and yet well, it seemed a wasteful thing to do.
His father had never discussed politics with him, but Vogt had learnt enough by himself to recognise the significance of the tattooing; Weise was a social-democrat! Well, that was nothing so very bad. At home in the village there were numbers of social-democrats, chiefly workers in the large fire-clay factory by the river, and they were all very good sort of people.
Rhodes has found seven veins of coal, five of which are very good, and he has worked the whole of them. There is also as good fire-clay as any yet discovered, the finest grade being pure sandstone, which stands fire as hearthstones in furnaces better than any other. Shell ore, block ore, and limestone also exist in abundance. The iron enterprises in which Mr.
They must have suspected that it was fire-clay and that you had found a deposit of value. They took some along to test, and rolled what was left into a ball again, thinking you would never notice the difference. But they forgot that clay would take finger-prints so readily, and they have left their calling cards behind them."
Delivered to the gas companies at thirty shillings a ton, it fetches forty shillings when the gas-men have done with it. It seems to be composed of peat which by a few millions of years of saturation in water containing iron has become like iron-rust. The soapstone of Killygordon is used instead of fire-clay, and is also made into French chalk.
I was sure we had more clay than that. I meant to make a little pot of it." "We did have more. I'm sure of it. You don't suppose those men could have taken any of it, do you?" "Let me see," said the ranger. He took the ball and examined it critically. "That looks like fire-clay. If it is, and the deposit is of any size, you have found something of value.
The tube, i, is provided with a number of small perforations, r, at its upper end, the sum of whose areas is at least equal to the area of the tube, and by which the gaseous mixture is distributed within the chamber, k. Upon the upper closed end of the tube is fixed a cup or inverted thimble, o, of fire-clay. A refractory cone, l, surrounds this cup and rests by its base upon the cup.
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