Abstract: An elongate, electric resistance heater having a tubular case, a plug in and spaced from one end of the case and elongate, flexible jacketed power lines extending through the plug and axially outward from said end of the case, an elongate, tubular, flexible braided metal sheath about the lines and coupling means coupling said end of the case and the end portion of the sheath adjacent thereto, said coupling means including elongate concentric inner and outer tube parts arranged with said end portion of the sheath held tight therebetween, a radially outwardly projecting flange on one of said parts arranged within said end portion of the case adjacent said plugs and retaining means at said end of the case axially outward of the flange and holding the flange and its related parts and sheath against axial outward displacement in the case and relative to the lines.

Abstract: A humidifying and tempering apparatus for use in an oxygen delivery system and comprising a vessel, a supply of water in the vessel, a nebulizer in the vessel above the water, a supply of oxygen under pressure connected with the nebulizer, an elongate water conducting tube connected with the nebulizer and extending downwardly into and through the water, an elongate resistance heater element concentric within and extending longitudinally of the tube to heat that water drawn through the tube by the nebulizer to be mixed with the oxygen in the upper portion of the vessel and an oxygen delivery line communicating with the vessel above the water and conducting tempered humidified oxygen to a location for use.