III. CONTRIBUTIONS FROM THE PHYSICAL LABORATORY OF HARVARD UNIVERSITY: ON THE EXISTENCE OF CERTAIN ELEMENTS, TOGETHER WITH THE DISCOVERY OF PLATINUM, IN THE SUN. Presented by Professor John Trowbridge, March 9, 1887

LATE in the fall of 1886 it was decided by the writers, who were then at work in the Physical Laboratory of Harvard University, to attempt a revision of some of the previous work in regard to the chemical constitution of the sun, as well as to discover, if possible, new facts bearing on the same subject. For the purpose of this investigation a magnificent diffraction grating, made by Professor Rowland of Baltimore, was kindly placed at our disposal by Professor John Trowbridge...