Copy letter from Herbert Rix, to Messrs Collings Herewith are [Harold Baily] Dixon's diagrams [not attached]. All except the three sheets of curves may be put in hand at the rate upon which Collings' estimate is reckoned. The author says the small squares must be shown. Rix refers Collings to a paper by Dixon in 'Philosophical Transactions [of the Royal Society]' 1874, part two, page 674 and queries if the curves can be done with the same scale. If not the diagrams should be returned and the Messrs should say what the difference will be in the estimate. 1 October 1892