Abstract: A finned tube for heat transfer from one medium to a second medium, and the method of manufacture, is disclosed. A helical fin of the finned tube has an area of compressed fins positioned proximate an insertion section which has a metal tube exposed with the helical fin removed therefrom. The compressed fins are a portion of the helical fin which has been compressed so that the helical fin in the area of the compressed fins is more closely spaced than the remaining portion of the helical fin. A base portion of the helical fin in the area of the compressed fins is layered and compressed on itself and is compressed against the metal tube. The layers of the base portion are compressed together and to the metal tube of the finned tube, which causes the layers of the base portion to bind together and bind to the metal tube to prevent movement of the helical fin in the area of the compressed fins in a direction parallel to the longitudinal axis of the finned tube.

Abstract: This disclosure pertains to a web process control apparatus utilizing a pair of arms disposed parallel to one another and pivoted at a location outward from and adjacent to a marginal edge of a travelling flat web. Process control sensors detect various characteristics of the web and are located at each extreme free end of the arms. The web passes between opposed faces of the arms. The arms are pivoted in substantially ninety degree arcs along the surface of the web as the web moves in a direction parallel to the marginal edges thereof. The characteristics of the web to be measured is continuously scanned as the arms move in a prescribed controlled fashion, yielding in one direction, if so desired, a linear measurement transverse to the direction of web travel.