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Some chilly evening, as the shadows thicken, he shambles out of the town, and seeks the limekiln in the ploughed field, where, the substratum being limestone, the farmer burns it. Near the top of the kiln the ground is warm; there he reclines and sleeps. The night goes on.
Once safely through the kiln it had nothing to fear short of deliberate destruction. The message intrusted to a terra-cotta slab or cylinder could only be finally lost by the reduction of the latter to powder.
For example, the salt is used in the form of moulded hard porous cakes made from a damp mixture of common salt and rock salt. The cast-iron vessels must be heated uniformly, and the hot pyrites kiln gases must be passed downwards through the salt in order to ensure uniform distribution. The hydrochloric acid is condensed in stoneware pipes connected with towers packed with coke or stoneware.
Ordinary black pottery can be simply the result of a special temperature in the pottery kiln; such pottery can be found almost everywhere.
In the midst of a circular clearing, surrounded by dense woods, smoked a charcoal kiln. It was less easy to breathe here, than down in the forest below. Where Nature herself rules, she knows how to guard beauty and purity, but where man touches her, the former is impaired and the latter sullied.
"You offer me a rough welcome," said a gloomy voice, as the unknown man drew nigh. "Yet I neither claim nor desire a kinder one, even at my own fireside." To obtain a distincter view, Bartram threw open the iron door of the kiln, whence immediately issued a gush of fierce light, that smote full upon the stranger's face and figure.
Looking out of the kiln door I saw a boy running at full speed down the lane with a small drain-pipe tucked under his arm. He stopped, put the pipe to his mouth, and blew a blast on this 'dread horn, then jumped through a gap in the hedge and disappeared. They were playing fox and hounds; who but a boy would have thought of using a drain-pipe for a horn? It gave a good note, too.
By locating the kiln near the abrupt wall of an abandoned quarry, ventilation was given from below by a connecting tunnel some twenty feet in length. Layers of wood and limestone were placed within until the interior was filled, when it was fired, and after burning for a few hours the draft was cut off below and above, and the heat retained until the limestone was properly burned.
The vapor overpowered me, I suppose. All I know is, I turned giddy, and dropped the stick in the kiln. I should have followed the stick to a dead certainty, but for Silas pulling me back by the hand. 'Let it be, says Silas. 'If I hadn't had hold of you, John Jago's knife would have been the death of you, after all! He led me away by the arm, and we went on together on the road to the wood.
The low flame-edged kiln, sending out dense clouds of creamy smoke, with a band of red and grey clothed workers moving in the haze, and usually some petticoated boys and women who come down with drink, forms a scene with as much variety and colour as any picture from the East. The men feel in a certain sense the distinction of their island, and show me their work with pride.
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