The rising and sinking motion is called convection current.
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Blasts of cold air were blow through heated iron to remove impurities. The result was much stronger more workable than steel.
A cauldron heated by wood to render beef fat then add the alkali and water mix plus the salt and stir till solids form,
No. They hardy took a bath because it was so hard to do. It required buckets of water to be heated and once that was done everyone then used the water.
Yes he did. Because of his proposal things heated up in Congress over slavery. He was very much apposed to slavery and dishearted with Congress over this he left.
Man power powered factories then coal powered them