He invented the helical form of the balance spring and a form of chronometer escapement much like Earnshaw's.
The centrifugal strain due to this is balanced by helical springs.
The Ford transverse rear spring was supplemented by two helical springs placed vertically between the Ford and tractor frames.
To give the water a rotary motion he had inserted a helical piece of angle iron, and so prevented deposition.
When the pilot valve opens, the pressure beneath the piston is relieved and it is seated by the helical spring above.
The carriage is supported on helical springs and solid steel wheels.
The translation of a body in helical motion is called its advance.
It consisted of a metallic cylinder having a helical indenting groove cut upon it from end to end.
helical hel·i·cal (hěl'ĭ-kəl, hē'lĭ-)
Of or having the shape of a helix; spiral.
Having a shape approximating that of a helix.