Copy letter from Robert William Frederick Harrison, to Dr William Napier Shaw, Fellow of the Royal Society Although Shaw is not one of the nominated members of the sub-committee for magnetics appointed by the Gassiot Committee, Harrison has been requested to ask if he can make it convenient to come to their next meeting, especially in view of the consideration of the question of testing of instruments which is to be discussed. Sends a summons enclosed. 19 May 1913