Inventors: Thomas Savery, Thomas Newcomen, James Watt

  Thomas Savery (1650-1715)
Thomas Savery was an English military engineer and inventor who in 1698, patented the first crude steam engine, based on Denis Papin's Digester or pressure cooker of 1679. 

Thomas Savery had been working on solving the problem of pumping water out of coal mines, his machine consisted of a closed vessel filled with water into which steam under pressure was introduced. This forced the water upwards and out of the mine shaft. Then a cold water sprinkler was used to condense the steam. This created a vacuum which sucked more water out of the mine shaft through a bottom valve. 

Thomas Savery later worked with Thomas Newcomen on the atmospheric steam engine. Among Savery's other inventions was an odometer for ships, a device that measured distance traveled.

Illustration of Thomas Savery's Engine circa 1698

• Thomas Savery - Biography of Thomas Savery and a description the introduction of his engine to the public
• An Engine To Raise Water By Fire - By Thomas Savery

Drawing of Thomas Savery

Thomas Newcomen (1663-1729)

Illustration of Thomas Newcomen's Engine circa 1712

Thomas Newcomen was an English blacksmith, who invented the atmospheric steam engine, an improvement over Thomas Slavery's previous design. 

The Newcomen steam engine used the force of atmospheric pressure to do the work. Thomas Newcomen's  engine pumped steam into a cylinder. The steam was then condensed by cold water which created a vacuum on the inside of the cylinder. The resulting atmospheric pressure operated a piston, creating downward strokes. In Newcomen's engine the intensity of pressure was not limited by the pressure of the steam, unlike what Thomas Savery had patented in 1698. 

In 1712, Thomas Newcomen together with John Calley built their first engine on top of a water filled mine shaft and used it to pump water out of the mine. The Newcomen engine was the predecessor to the Watt engine and it was one of the most interesting pieces of technology developed during the 1700's.

• Thomas Newcomen Biography
• The Newcomen Steam Engine

James Watt (1736-1819)

Engraving of James Watt

James Watt was a Scottish inventor and mechanical engineer, born in Greenock, who was renowned for his improvements of the steam engine. In 1765, James Watt while working for the University of Glasgow was assigned the task of repairing a Newcomen engine, which was deemed inefficient but the best steam engine of its time. That started the inventor to work on several improvements to Newcomen's design. 

Most notable was Watt's 1769 patent for a separate condenser connected to a cylinder by a valve. Unlike Newcomen's engine, Watt's design had a condenser that could be cool while the cylinder was hot. Watt's engine soon became the dominant design for all modern steam engines and helped bring about the Industrial Revolution.

A unit of power called the Watt was named after James Watt. the Watt symbol is W, and it is equal to 1/746 of a horsepower, or one Volt times one Amp.

James Watt Biographies

• James Watt - 1 Page
• James Watt History of the Growth of the Steam Engine - 4 Pages
• James Watt - 5 Pages

• What is a Steam Engine?
• The History of Steamboats
• Steam Engine Library
• How Steam Engines Work
• The Steam Traction Engine
  No one person can be credited with inventing the steam powered road vehicle, possibly the first ideas came from a French military engineer called Nicolas Cugnot.
• The Steam Turbine - Charles Parsons
  The idea of the steam engine, which Charles Parsons patented, was not a new one. Hero of Alexandria had demonstrated a crude form of steam turbine around 130 BC. However, Charles Parsons patented his new steam turbine engine on April 1884 and immediately used the engine to drive an electrical generator, which he also designed.
• Benjamin Franklin Tibbets
  Canadian, Benjamin Franklin Tibbets invented the world's first practical compound marine engine, used in the steamer "Reindeer." The Reindeer was the fastest steamer in the 1820's.
• George H. Babcock & Stephen Wilcox
  Babcock and Wilcox co-invented the water tube steam boiler, a safer and more efficient boiler.

©Mary Bellis