Copy letter from Robert William Frederick Harrison to A D Hall 'Dear Mr Hall, I am very sorry that when I promised your Committee a room for their meeting tomorrow I overlooked the monthly meeting of the National Physical Laboratory Committee which meets regularly here and requires a large room at the Society of Antiquaries, opposite this building, to which members of your Committee will be directed on arrival here. I hope this arrangement will not lead to any inconvenience.' 19 November 1908