(London), 1861. No wrappers as issued, uncut and unopened. Offprint from "Royal Institution of Great Britain. Weekly Evening Meeting, June 7, 1861" 10 pp.
First edition in the off-print issue. Tynfdall's investigations into the effects of solar and heatradiation from the sun was an area in which he made his major contributions to meteorology and physics.
Order-nr.: 38900