Copy letter from Robert William Frederick Harrison, to Dr Charles Chree, Fellow of the Royal Society Harrison responds to Chree's letter, informing thim that there will be no objection to his copying curves or diagrams in his papers, published in Philosophical Transactions of the Royal Society, for use in his Encyclopedia Britannica article on "Terrestrial Magnetism", though he stipulates that due acknowledgement is to be made of the source from which they are reproduced. 11 November 1907