Synthesized answer
The provided passages do not explicitly detail the practical implications of the experiments. However, they do suggest that high frequencies are desirable for producing certain results and as a convenient means of obtaining high potentials [1]. These high potentials are then necessary for the demonstration of most of the experiments contemplated [1].
The passages indicate that the lecture deals with alternating currents of high potential and high frequency [2]. The author mentions having presented some results in a novel line of work previously [2]. While the passages emphasize the importance of high frequency and high potential for producing the observed effects and demonstrating the experiments, they do not elaborate on what those effects are or what the wider practical applications might be.
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
frequency is essential for the production of the results presented is a question which, even with my present experience, would embarrass me to answer. Some of the experiments may be performed with low frequencies; but very high frequencies are desirable, not only on account of the many effects secured by their use, but also as a convenient means of obtaining, in the induction apparatus employed, the high potentials, which in their turn are necessary to the demonstration of most of the experiments here contemplated.
Title: Experiments with alternate currents of high potential and high frequency by Nikola Tesla Description: A lecture delivered before the Institution of Electrical Engineers, London, February 1892. Complete with illustrations.A short time ago I had the honor to bring before our American Institute of Electrical Engineers some results then arrived at by me in a novel line of work. I need not assure you that the many evidences which I have received that English scientific men and engineers were interested in this work have been for me a great reward and encouragement. I will not dwell upon…