Abstract: A control apparatus for an air-conditioner provided with a flow controlling means which controls the amount of air blown into a room, a temperature control means to which controls the temperature of air blown, a skin temperature detecting means which detects the actual skin temperature of persons in the room, a temperature sensation determining means which determines the actual temperature sensation of persons in the room in accordance with the skin temperature detected above and the rate of change of this detected skin temperature, and an electrical control means which makes the flow control means bring the temperature sensation determined above into line with the target temperature sensation and which makes the temperature control means perform temperature control.

Abstract: A spark plug, wherein a central electrode is electrically insulated from an uter electrically-conductive casing (ground to an internal combustion engine when in use) by an insulator sealed in the casing, separating the central electrode from the casing and having a taper-nose portion which is designed to be exposed to unburnt carbon in combustion gases of a combustion chamber, is modified to facilitate carbon removal from the taper-nose portion. Discrete isolated particles or isolated aggregates of particles of vanadium oxide are adhered over the exposed surface of the taper-nose portion to improve the self-cleaning ability of the spark plug without decreasing the degree of electrical insulation provided by the insulator. The particles of vanadium oxide are formed from a suspension which is applied to the surface of the taper-nose portion of the spark plug. The resulting coating is then dried in situ.