Electrically coupled cones : This patented device (US
Patent 3,048,046) is composed of thin laminates of paramagnetic material. The laminates are separated with semidielectric
materials which also localize the effect of the inductive field. There is a field generating device within the driving
cone. Adjacent to the cone is a positioning motor for the field generating device. The field created in a particular
section of the driving cone induces a magnetic effect in the surrounding lamination. This causes the laminate and its
opposing lamination to couple and rotate with the drive shaft. The ratio of diameters of the cones, at the point selected
by positioning the field generating component, determines the speed ratio.