These circular spinning machines (also known as 'throwing machines'), were the most significant innovation of the factory.
"About 300 to 500 spinning machines were inefficient," he said.
David and his brother John worked twelve-hour days as piecers, tying broken cotton threads on the spinning machines.
Even in the modern day, many spinning machines are based on this principle.
He rebuilt the mill to hold four or five water-powered spinning machines, each with 50 spindles.
From 1927 to 1938 the plant was designed and built the country's first spinning machines, created a new base of textile machinery.
Homemade spinning machines date from the 1890s.
Today most of the spinning machines have been motorized.
All these inventions were intended for the registration and improvement of the running of the spinning machines.
A pedal-powered spinning machine that shoot riders into the air.