The paper describes a study of the transfer of lightning surge voltages through transformers, between high-voltage overhead transmission-lines and directly connected generators. As such, it covers similar ground to the companion paper by E. L. White, which deals more fully with the theoretical aspects of the subject, and also reports simulated on-site surge tests on three transformer-generator units connected to systems of 132–400kV. The present paper has a rather more practical bias, and presents the results of tests on seven transformers connected to generators (two assembled on site in power stations), and on further transformers, 13 in all, connected to impedance networks simulating the appropriate generators. Transformers with 18–600MVA ratings, for connection to 33kV up to 400kV overhead-line systems, are covered here. Simulation of each phase of the generators, both by resistors (representing the winding surge impedances), and by parallel LC circuits, was studied; the comparisons made between the amplitudes and waveforms of the transferred surges reaching the ‘generator’ terminals, and those measured on the actual machines, showed that the LC network in all cases gave much the best approximation to the real-machine conditions. A basis for calculation of the transferred voltage transient, in amplitude and waveshape, has been developed and is given in an Appendix. It is shown that the relevant LC parameters can readily be calculated from known machine-design parameters, of which the most important is the unsaturated sub-transient reactance. Calculated results, obtained by computer, are given for all cases investigated experimentally. The present work forms a continuation of an earlier study, in which the theoretical basis for calculation of the surge transfer was first proposed; both the theoretical and the experimental aspects of that investigation have been considerably extended. The mechanisms of electromagnetic and capacitive surge transfer are discussed, both in order to explain the effects of transformer and machine parameters, and to interpret discrepancies between theoretical and experimentally determined surge transfer. Conclusions are drawn on the practical importance of surge transfer to generators, the practicability of calculating these transients, and also on appropriate methods for separately impulse-testing generator transformers.