From 1882, the article "Some Further Results on Sun Thermometer Observations..." by Henry F Blanford, reprinted from the Journal of the Asiatic Society of Bengal, may be downloaded below (14 pages):

From 1889, the article "On the Black Bulb Thermometer in Vacuo", reprinted from the 9-20-1889 issue of Lectrician, by Herbert M'Leod may be downloaded below (2 pages):

From 1898, the US Weather Bureau publication "An Improved Sunshine Recorder " by DT Maring is available below (14 pages):

From 1901, a copy of "Instructions for the Care and Management of Sunshine Recorders", US Weather Bureau Circular G by Charles F Marvin may be downloaded below (20 pages):

From 1916, the Smithsonian publication "The Pyranometer - An Instrument for Measuring Sky Radiation" by C G Abbot and L B Aldrich is available for download below (13 pages):

From 1916, the Smithsonian publication "On the Use of the Pyranometer" by C G Abbott and L B Aldrich is available for download below (13 pages):

From 1917, the US Bureau of Standards publication "Some Characteristics of the Marvin Pyrheliometer" by Paul D Foote may be downloaded below (32 pages):

From 1922, the publication "The Vacuum Pyrheliometer and the Solar Radiation" by Frank Bigelow is available below (45 pages):

From 1922, the Smithsonian publication "The Melikeron - An Approximately Black-Body Pyranometer" may be downloaded below (14 pages):

From 1923, the 5th edition of this manual may be downloaded below (18 pages):

From 1927, the Indian Meteorological Department publication "Sky Illumination at Sunrise and Sunset" by K R Ramanathan may be downloaded below (18 pages):

From 1932, the Smithsonian publication "An Improved Water Flow Pyrheliometer and the Standard Scale of Solar Radiation" by C G Abbot and L B Aldrich is available below (11 pages):

From 1946, the Smithsonian publication "Sunspot Changes and Weather Changes" by H H Clayton is available below (33 pages):

From 1948, the Smithsonian publication "Smithsonian Pyrheliometry and The Standard Scale of Solar Radiation" may be downloaded below (6 pages):

From 1954, the German language publication "Kleines Absolut-Pyrheliometer" by J Georgi is available below (85 pages):