Not Associated with Steam Engine

James Hargreaves was not associated with the steam engine. Let's understand the roles played by the other three:

James Watt

James Watt is known for making significant improvements to the steam engine. He worked on the design and improved its efficiency. He added a separate condenser that allowed the engine to use less fuel and produce more power. These improvements made the steam engine more practical and efficient, leading to its widespread use in various industries.

Newcomen

Thomas Newcomen is credited with inventing the first practical steam engine. His engine used steam to create a vacuum that pulled a piston down, which was then pushed back up by atmospheric pressure. Although not very efficient, his engine was used in coal mines to pump out water and improve mining conditions.

Matthew Boulton

Matthew Boulton was a business partner of James Watt. He provided the funding for Watt's steam engine improvements and helped to market and sell the engines. Boulton was a successful businessman who helped to bring the steam engine into widespread use, particularly in the textile industry.

Conclusion

James Hargreaves, on the other hand, was not associated with the steam engine. He was a weaver and inventor who developed the spinning jenny, a machine that revolutionized the textile industry by allowing workers to produce multiple threads at once.

• James Watt was a Scottish inventor, mechanical engineer, and chemist who improved on Thomas Newcomen's 1712 .
• Newcomen steam engine with his Watt steam engine in 1776 .
• Matthew Boulton FRS was an English manufacturer and business partner of Scottish engineer James Watt.
• James Hargreaves was a carpenter .
|| So , option " D " is correct . ||