Rotary hook creating a lockstitchThe rotary hook continuously rotates in place, hooking the upper thread each time its pointed tip passes the 12 o'clock position.
12.
Only later it was called the " White Vibrating Shuttle ", when a rotary hook model named the White Family Rotary was added to the product line.
13.
His machine " had a considerable sale, but was not satisfactory to its inventor, who set himself to work to produce something more practical " a new rotary hook design.
14.
The White Sewing Machine Company developed a machine around it which became the company's flagship product so much so that it was originally named the " White Sewing Machine ", only later taking the name " White Vibrating Shuttle " when a rotary hook model was added to the product line.
