(10)  Plot a graph of temperature T of brass disc as a function of         time. A typical plot is shown in Fig. 2. Draw tangential line        to the curve, corresponding to the temperature, T₂ and         determine its slope. The slope is equivalent to 
                        

   (11)  Calculate thermal conductivity, ‘K' using equn (3) and by multiplying a            correction factor
                          
          Here, h is the thickness of the brass disk. The correction
          factor is introduced because the cooling measurement was           not exactly the same environment of steady state           measurement.