London, England/london2C-196

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William Henry (19) investigated absorption of gases and formulated "Henry's Law." William Hyde Wollaston (20) discovered palladium and rhodium, as well as malleable platinum. Charles Hatchett (21) discovered niobium (columbium). Humphry Davy (22) first prepared metallic potassium, sodium, calcium, strontium, barium, and boron. John Dalton (23) proposed his Atomic Theory as well as developing a list of atomic weights. Matthew Boulton worked with James Watt to develop modern steam engines {LINK: Birmingham120}. James Watt (30) developed the efficient steam engine {LINK: Birmingham030}.