The Series Is Difference Between The Value Of Month M And Month M+6 Is Divided By Month M And Multiplied By 2. Source: For 1948-1964, Series 08332. For 1965-1967, See Unrevised Data From Series 8,332.
This NBER data series m08359 appears on the NBER website in Chapter 8 at http://www.nber.org/databases/macrohistory/contents/chapter08.html.
NBER Indicator: m08359
Release: NBER Macrohistory Database
National Bureau of Economic Research, Rate of Change (Six Month Span At Annual Rate), Hourly Compensation, Manufacturing, All Employees (Centered) for United States [M08359USM156SNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M08359USM156SNBR/, August 3, 2015.