From 'The Effect of Solar Radiation variations on the climate of the Earth, Tellus 21 (1969) p611. 'Fig 1 represents the secular variation of annual temperature in the northern hemisphere that was calculated from the maps of temperature anomalies for each month for the period 1881 to 1960 which were compiled at the main geophical Observatory [USSR]....Line 2 gives the anomalies averaged by ten-year periods.