J. J. McMahon

Discussion on "Some problems in traction development-tramway feeding networks"

H. A. Ratcliff, Gisbert Kapp, A. P. Trotter, 1913 .

Discussion on "The "G.B." system from a tramway manager's point of view"

Silvanus P. Thompson, A. P. Trotter, H. E. Yerbury, 1909 .