Scottish inventor James Watt was born on this date in 1736. 10 things you might not know about him.
Watt’s father was the treasurer and magistrate of Greenock, and ran a successful shipbuilding business. As a boy, Watt spent time in his father’s workshop and had his own set of tools, a bench, and a forge and used them to make models of things like cranes and barrel organs.
By the age of 17 he’d decided he wanted to be a mathematical-instrument maker. He trained in Glasgow and later London.
He opened a shop in 1757 at Glasgow university and made mathematical instruments such as quadrants, compasses and scales.
In 1764 he married his cousin Margaret Miller and had six children with her, but she died nine years later. Watt married his second wife, Ann MacGregor, in 1776, and had two more children with her.
In about 1764, Watt was given the task of repairing a type of steam engine called a Newcomen engine. These were used to pump water out of mines. As he worked on it, he realised it wasn’t very efficient and he started working on ways to improve it, which included designing a separate condensing chamber so less steam was lost. His first patent in 1769 covered this device and other improvements on Newcomen's engine.
He might have applied for the patent sooner, except in 1766 he became a land surveyor and his time was taken up with marking out routes for canals in Scotland.
Watt’s partner and backer was the inventor John Roebuck, and later Matthew Boulton, who took over Roebuck’s firm. Boulton & Watt became the most important engineering firm in the country. In 1785, Watt and Boulton were elected fellows of the Royal Society.
Royalties on Watt’s patents made him a wealthy man, and he had time to spend on other interests. He was a member of the Lunar Society in Birmingham, a group of writers and scientists who wished to advance the sciences and the arts. Watt bought an estate at Doldowlod, Radnorshire, and from 1795 onward gradually withdrew from business.
Erasmus Darwin, grandfather of Charles Darwin, was Watt’s doctor.
A unit of measurement of electrical and mechanical power – the watt – is named in his honour.
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