Letter from Oliver Heaviside, Paignton, Devon, to [Joseph] Larmor He relates the various forms of address he has been given and thanks Larmor for the gift of his book. He has not given up the velocity of hydrogen alpha, but he could not see a way to understand the mechanical meaning of resistance. It is 'the only mechanical analogy...of the quasi electric solid type that as yet yet proposed, & which is electromechanically satisfactory'. He supposes that Larmor agrees with Lord K's [Kelvin's] rotational aether, which he thinks important if Larmor could develop it. Heaviside has written about it twice, in 1891 and 1892. In a postscript, he refers to a paper by on dimensions by W.Williams in the Philosophical Magazine. 6 December 1893