159. You are in compartment «A» as shown in Figure 2 of the illustration, and suspect there is a fire in compartment «B». In order to check for and confirm the fire in compartment «B» you should __________

To confirm a suspected fire in an adjacent compartment, carefully feel the bulkhead for heat without opening the boundary to avoid intensifying the fire or exposing personnel to hazardous conditions; this method detects heat conduction and provides evidence of a fire without introducing air or flame.