|
(2 enclosures) U. S. Coast Survey Office
Washington, April 21 1877
Dear Sir, Herewith I forward two papers by Assistant Chas. S. Peirce: one in french relating to the pendulum to be forwarded to Prof. Plantamour at Geneva, and the other suggesting "the wave length of some line in the solar spectrum as a standard of length". I have submitted the matter to Mr. Rutherfurd, and his opinion as to its practicability and ultimate success is favorable. He is willing with Assistant Peirce's aid to undertake the necessary experiments, having peculiar facilities for the purpose, and having actually produced the finest gitter and diffraction plates yet made. Will you please carefully consider |
