NEW YORK TRIBUNE, March 10, 1875

* Samuel Pierpont Langley
* Allegheny Observatory
* Solar heat lecture w/ illustrations

Page 2 has one column headings: "SOURCES OF SOLAR HEAT", "A Lecture By Prof. S. P. Langley", "Immense Amount Of The Heat Of The Sun". This contains very lengthy text and 7 related illustrations. Other news of the day. Complete in 12 pages, nice condition.