The Ostwald coefficients L(2,1) of He, Ne, Ar, Kr, N-2, O-2, CH4, CF4, and SF6 dissolved in several homologous n-alkanes, n-ClH2l+2, 6 less than or equal to l less than or equal to 16, have been measured at 298.15 K and atmospheric pressure with a modified Ben-Naim/Baer apparatus. Altogether, 99 gas/liquid systems were investigated. Both pressure control and measurement of the volume of gas dissolved in a given volume of solvent were controlled by a microprocessor. This improved, medium-precision apparatus (the imprecision is approximately +/-0.5%) combines easy handling with automated data retrieval and is totally mercury-free. Data reduction is presented in some detail, including the estimation of auxiliary quantities, such as second virial coefficients and partial molar volumes at infinite dilution. The effect of chain length I upon solubility is shown, and some correlations between L(2,1), or the derived Henry fugacities H-2,H-1, and appropriate molecular and/or bulk properties of the gases and n-alkanes are discussed.