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After spending nearly nine years in Martinique as an engineer of the military Charles returned to France mostly due to ill health. In 1781 he entered the French Academy of Sciences where he was a part of the administration of waters and fountains, the reform of hospitals and the system of weights and measures. He was able to publish his paper in 1787 where he proved his famous Coulombs Law. Soon came the outbreak of the French Revolution and Charles decided to retire to a small cottage in Blois. Here he was able to devote his time to scientific research. He studied the friction of machinery and torsion dealing with windmills and also the elasticity of metal and silk. He married a young girl in her twenties and had two sons, one in 1790 and the latter in 1797. Charles also spent his time experimenting with botanical physiology and he loved being out in the country teaching his smallest son Charles. Coulomb's life ended soon after he came across a fever and was bed ridden until June of 1806.