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Figure 57 — Transformation of tlie interior of a circle into an infinite strip 91 



Figure 58 — A line vortex of circulational strength F near a circular cylinder 



with circulation F'- F around it 93 



Figure 59 - Streamlines between two rigid cylindrical surfaces, centered 



at x^ , X2 95 



Figure 60 — Representation of a line vortex within a cylindrical shell 95 



Figure (51 — Streamlines between a circular cylinder and a wall 96 



Figure 62 — A line source near a wall 99 



Figure 63 - Streamlines due to a line source S near a wall 101 



Figure 64 — A row of equal line sources or vortices 101 



Figure 65 — Flow net due to a line source between walls, or forming one member 



of a row of sources 102 



Figure 66 - Flow past a semi-infinite cylinder between walls a apart, or along a 



channel narrowed in a certain manner 104 



Figure 67 — Line source on a rectilinear boundary or in a corner 105 



Figure 68 — Streamlines in a channel narrowed in a certain manner, as constructed 



with use of line sources 106 



Figure 69 — Line source on a rectilinear boundary 106 



Figure 70 — Flow net due to a row of vortices or sources of alternating sign, or 



due to a vortex between walls a apart 108 



Figure 71 — Row of equal line dipoles with transverse axes 109 



Figure 72 — Nearly circular cylinder between walls, obtained with use of dipoles 



in a stream 110 



Figure 73 — Streamlines between two nearly circular cylinders, mounted in walls 



or forming two members of an infinite grating 112 



Figure 74 - Row of equal line dipoles with longitudinal axes 112 



Figure 75 — Streamlines past a grating of nearly circular cylinders 115 



Figure 76 — Row of line dipoles with axes longitudinal but alternating in direction .. 115 



Figure 77 — A line dipole at (c,0) and its image in a wall along the y-axis 116 



Figure 78 — A line source at P outside a circular cylinder 117 



Figure 79 — Streamlines from a line source at P near a circular cylinder 119 



Figure 80 — Image of a line dipole in a circular cylinder 120 



