Abstract: An automotive detailing mat and method of protecting a surface during the detailing of an automotive wheel and tire assembly, the automotive detailing mat including a planar body having a thickness, a first major surface opposite a second major surface, and a plurality of edges, and wherein the plurality of edges comprises a first edge defining a U-shaped recess in the planar body disposed at a first line of symmetry perpendicular to the first edge, and wherein the method includes positioning the automotive detailing mat around the automotive wheel and tire assembly such that the U-shaped recess of the automotive detailing mat is adjacent to and abuts the portion of the automotive wheel and tire assembly forming the contact patch to thereby form a seal between the automotive wheel and tire assembly and the automotive detailing mat.

Abstract: An acoustic vapor type indicator is disclosed in which an audible signal such as a whistle is produced when a vapor is flowing through the indicator. The indicator includes an air chamber having an inlet for connection with a closed vessel containing a quantity of a gas other than air. When the closed vessel is open to the indicator, the gases within the vessel first force the air from the air chamber through an outlet orifice producing a whistle of a first pitch. Once the air has been removed and the gas within the closed vessel passes the outlet orifice, due to a change in density the pitch produced by the indicator will be changed. Alternative embodiments disclose automated pitch detection means as well as a pitch recognition device.