Industrial Revolution Birth of modern industry and the social changes that accompanied it started in Great Britain's textile industry Before, cloth was made by hand using simple human powered machines. 1700s: inventors created machines that mechanized cloth making By the 1800s:
The question of what the difference between a 20 mil liner and a 27 mil liner is a common question when it comes to vinyl pool liners. The obvious answer is the thickness of the pool liners. 27 mil liners are thicker which can help protect against rougher pool surfaces such as concrete.