Letter from James Dewar, Royal Institution of Great Britain, London, to [Joseph] Larmor He hopes that Larmor does not think the experiments touched upon the light pressure question. He had to stop Kelvin from rushing too soon to what he would like. He discusses radiation and the maximum working pressure of hydrogen, oxygen, and helium in a radiometer. His helium work will end, or will end him [liquifying the gas] and he thinks it is now a case of money, and whether it is the Royal Institution's duty to pursue the matter further. 16 July 1907