(under the class definition) Subject matter wherein a flat ribbon or strip-like resistance element is coiled or otherwise formed as a flat or cylindrical helix with the narrow edges of the resistance element forming the outer and inner boundary surfaces of the helix, the wider flat surfaces of the resistance elements extending transverse to the helix.
(1) Note. The subject matter of this subclass is most commonly a cylindrical core with helically disposed grooves therein, and a ribbon resistance element having an edge extending in the groove. In this subclass the resistance element in a strip with ribbon-like characteristics. However, the element is bent or curved edgewise as opposed to the common flatwise bend occurring in the subject matter of subclasses 279+ below.
SEE OR SEARCH THIS CLASS, SUBCLASS:
58, for a resistor including a ventilated helical element.
261, 263 and 267+, for incased, embedded or housed helical or wound resistors.
282, for a resistor whose element is a helix formed from a bent ribbon. See also (1) Note above.
296+, for helical or wound resistors, generally. 333, for resistors of a particular configuration not otherwise classified.
