This section is from the "A Complete Dictionary of Dry Goods" book, by George S. Cole. Also available from Amazon: A complete dictionary of dry goods and history of silk, cotton, linen, wool and other fibrous substances,: Including a full explanation of the modern processes ... together with various useful tables.
Helix. A term used in needle-making, with reference to the manner in which the eye is finished. The best qualities of needles always have their eyes " helixed." The operation is performed by stringing the needles immediately after the eye has been punched out, upon a fine hardwire, which when set in motion causes the needles to rapidly revolve. The rapid revolution on the wire polishes the edges and inside of the eye, thus preventing the cutting of the thread in sewing. [See Needles]