A glass tube of length 133 cm and of uniform cross section is to be filled with mercury, so that the volume of the tube unoccupied by mercury remains the same at all temperatures. If coefficients of cubical expansion for glass and mercury are respectively `(2.6 xx 10^-5)^@C^-1` and `(18.2 xx 10^-5)^@C^-1`, calculate the length of mercury column.