DAB = binary coefficient of mass diffusion in the mixture g = gravity acceleration h = height difference between the interfaces mercury-L; LHg = length of gas capillary and of mercury tube, n = molecular concentration NRe = Reynolds number P ; Ptot. = experimental and total pressure of the gas, respectively AP = pressure drop corresponding to height difference, h q; q H g = volumetric flow rate of the gas and of the mercury, respectively r; rHg = radius of gas capillary and of mercury tube, respectively R = gas law constant So = area of the interface mercury-gas at zero inclination of the viscometer S = area of the interface mercury-gas in the viscometer reservoirs during a run t; t ' = time required for displacing the mercury and the gas during a run, respectively.7 = t ' when P 2 50 atm.

2L.I0. The Expression of L z (p) in Spherical Harmonic Functions 86 2L.l1. The Asymmetry of L z (P) Relative to the Equator, and its Seasonal Variation 91 2L.12. Comparison of Lz(p) and Sz(p) 93

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PART I—THE INITIAL PHASE 1—Introduction and summary 2—The motion of an infinite plane‐slab stream in a uniform magnetic field 3—The motion of a cylindrical stream in a uniform magnetic field