A positive resist composition comprises: a resin having an aliphatic cyclic hydrocarbon group and increasing the solubility to an alkali developer by the action of an acid; a compound generating an acid upon irradiation with an actinic ray or radiation; and a nitrogen-containing compound having in the molecule at least one partial structure represented by following formula. In general, the flash guard is attached to a support frame by an arm, a linkage mechanism pivotally interconnects the arm and the support frame, and an extensible power member connects the support frame to the linkage mechanism. A gap compensating unit compensates control weighting coefficients with a gap error signal and outputs the updated weighting coefficients acquired as a result of the compensation. 9 and equal to or larger than 0. The removably attached container is provided for storing pet food, while the bowl and cover are used for storing water.