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Updated: May 17, 2025
They clambered over small rocky obstacles until they came to the end of the scorched line. They surveyed the state of things in silence. A ship had landed here recently. Its blue-white rocket flames had melted gulleys in the soil, turned it to slag, and then flung silky, gossamer threads of slag-wool over the rocks nearby.
Ordinary floors may be rendered heat-proof by partially filling the space between ceiling and floorboards with sawdust or sheets of slag-wool laid on boarding nailed to fillets on the joists. The sawdust should be filled up to the top of the joists; over this a layer of thick felt, and the boarding above. This, however, is only a makeshift when compared with a solid floor of concrete.
The floors above and below should if not of solid fireproof construction be formed as described in the section dealing with the design of the sudorific chambers, with puggings of slag-wool, asbestos, sawdust, or materials having similar properties. Windows should be double.
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