Lesson 6- Vapor Compression Theory. Oliver Evans developed a vapor compression refrigeration theory. The theory explains how circulating refrigerant cools down an environment by removing heat. Many other people later invented the refridgerator.
Lesson 7- Oliver Evans. Oliver Evans was a creative inventor who started out by solving the flour milling problems. He developed process automation and pioneered high pressure steam engines. He was a creative marketer and secured important clients.
Lesson 8- Percussion ignition. John Forsyth invented the percussion cap system. It fired faster, produced less smoke, and worked in rain. He didn’t succeed in business but other people did.
Lesson 9- Canning process. Nicolas Appert invented the canning process for a prize of money. It cheaply preserves food taste and nutrition. Glass jars were quickly replaced by tin cans.