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The steam room—a space they call the “Caldarium”—has two showers, one indoor and one outdoor, “so you can go directly outside and take a shower and cool down,” then jump in the pool, Mr. Cummings said.

In ancient times, the Romans named it the caldarium; we simply call it the hot tub.

These moulds are sprinkled over with charcoal dust before the caldarium copper is to be poured into them, and the same dust is sprinkled over the copper when it is poured in, lest the cadmia and yellow copper should freeze before they have become well mixed.

Then he throws it into the tub containing hot water, for the caldarium copper is finer if quenched in hot water.

But when the copper, yellow or red or caldarium is re-smelted in the refining furnace, forty centumpondia are placed in it, and from it they make at least twenty, and at most thirty-five, centumpondia.