In 1891 Thompson developed the idea of a telegraph submarine cable that could increase the distance of the electrical pulse and therefore increase the speed of transmitting words across the telegraph cable. Until then there was an average speed of between 10 and 50 words per minute but his design was to counteract the discharging of electrical energy across the cable by introducing a return earth as part of the internal electrical structure of the cable (something like coaxial cable today). His idea, written about by Charles Bright in his book "Submarine Telegraphs", discusses the idea that the two wires could be designed as separate conductors but along their path they would be connected by an induction coil. This would allow for the introduction of capacitance and therefore allow for the distance of the electrical charge to increase so increasing the word count. This was a design that would help revolutionise submarine telegraphy and the future of telephone submarine systems.