Figures For The Third And Fourth Quarter Of 1885 Were Computed By Subtracting The Last Half Year (27.4) And Here Divided Equally For Two Quarters. This Computation Was Necessary Because Only The Figure For The Year Was Available. This Is Also The Case With The Third And Fourth Quarters Of 1886, Where The Last Half Year (98.4) Was Divided By Two. Source: The Economist.
This NBER data series q10018 appears on the NBER website in Chapter 10 at http://www.nber.org/databases/macrohistory/contents/chapter10.html.
NBER Indicator: q10018
Release: NBER Macrohistory Database
National Bureau of Economic Research, New Capital Applications for Great Britain [Q10018GBQ431NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/Q10018GBQ431NNBR/, August 1, 2015.