John Hanning Speke questions about the height and extent of the lake could not be answered easily. Speke's eyes were still bothering him and he only saw a small part of the southern end of the lake and his view was blocked by islands in the lake so he could not judge the size of the lake well. However, Speke did estimate the elevation of Lake Victoria at 4000 feet by observing the temperature at which water boiled at that level. (This lake's being substantially higher than Lake Tanganyika did make it a more likely candidate for the source of the Nile.) From
The Strange Affair of Spring-Heeled Jack and explorer John Hanning Speke. It includes actual historical events, namely the Spring-heeled Jack case, the assassination attempt on Queen Victoria in 1840, the search for the source of the Nile and the development of Darwin's theory of Evolution. A time-traveller from the distant future returns to 1840 to prevent an ancestor from attempting to commit an act of regicide. After failing in his mission, he returns to 1837 and recruits the 'Mad Marquess' to find his ancestor and correct the error. The result of his interference is an altered timeline in which technological advances have given rise to two