Scots-Irish mathematical physicist and engineer (1824 - 1907) who did important work at the University of Glasgow in the mathematical analysis of electricity and formulation of the first and second laws of thermodynamics. LS signed “William Thomson,” three pages on two adjoining sheets, 5 x 8, Glasgow University letterhead, July 25, 1890. Letter to Louis Olivier of Paris, in part: "I am sure the Council of the Royal Society of Edinburgh, will be very happy to do what they can in compliance with your wishes. They would, I am sure, be glad to send copies of all their Proceedings to you in return for copies of your journal should you wish for such an exchange." In very good to fine condition, with light toning, a short edge tear to the first page, and several small holes along the bottom edge.Format: LS