RUE, WARREN DE LA, BALFOUR STEWART AND BENJAMIN LOEWY.

Researches on Solar Physics. Heliographical Positions and Areas of Sun-Spots observed with the Kew Photoheliograph during the Years 1862 and 1863. Received March 31, - Read April 30, 1868.

(London, Taylor and Francis, 1870). 4to. No wrappers as extracted from "Philosophical Transactions" 1869 - Vol. 159 - Part I. Pp. 1-110, textillustr. a. 2 plates.

First printing of one of the first papers dealing with the photography of the sun. De La Rue invented the "photoheliograph" for the Kew observatory, and by means of it the first solar light-pictures of real value were taken. The conclusions arrived at by photographic means at Kew were communicated to the Royal Society in a series of papers drawn up jointly by De la Rue, Balfour Stewart, and Benjamin Loewy. They influenced materially the progress of thought on the subject they were concerned with and initiated astrophysics.

Order-nr.: 43528