Copy letter from Robert William Frederick Harrison, to F J S Hopwood, Railway Department, Board of Trade, S.W. and H J Chaney 'dear sir, I have sent to the members of the Metric Units Committee notice to attend the meeting appointed to be held here on Wednesday next the 19th., inst. at 3 o'clock, p.m. I am, very faithfully yours, Robt Harrison Assist. Sec. R.S. [Assistant Secretary of the Royal Society]'. 13 January 1898