1. The isolation of an ion, a precision measurement of its charge, and the correction of Stokes's law;Millikan;Phys. Rev.,1911
2. Mobility of ions in air . Part I . Negative ions in moist air;Tyndall;Proc. R. Soc. Lond. Ser. A Contain. Pap. a Math. Phys. Character,1926
3. The Mobility of Positive Ions in Gases;Tyndall,1938
4. The mobility of ions in air. Part II. Positive ions short age;Tyndall;Proc. R. Soc. Lond. Ser. A Contain. Pap. a Math. Phys. Character,1926