General correspondence, letters J-Y, on proposals to reform or decimalise the standards of weights and measures. The correspondence takes the form of answers to questionnaires to respected parties and asks opinions on proposed improvements and on systems used abroad. There is also a pamphlet called 'The Mechanic and Chemist' and a poster on the 1845 law of weights and measures as applicable to Ireland. The correspondents include J.V. Lamont, the Earl of Liverpool, W.H. Miller, C.W. Pasley, R. Phillips, G.A.A. Plana, L.A. Quetelet, P.M. Roget, E. Sabine, H.C. Schumacher, W.H. Smyth, W.S. Stratford, T. Thomson, C. Wheatstone, W. Whewell and Whitbread's Brewery.