sines of h are £-\±28 5, Jf_l+2L» I, N=1^ ^, (29) 1 -f- ra g0 1 -f ra <fr 1 + m q0 v/ as appears on dividing (28) by (1 + m)q0, the resultant of (1 + rna) E7, (l + mb) V, (1 4- mc) W. EQUIPOTENTIALS AND STREAMLINES On a' V cr the plane sections <p = constant are equipotential ellipses parallel to… … normal, whose direction cosines are i, M, N, we call the line e = const, a line of stream latitude. Thus e is the colatitude or obliquity of a surface element of o! V c'. The line e = 90° is the stream equator. This latter marks the contact of a tangent cylinder parallel to the polar normal, viz,…
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