Thomson,  William.  On a Machine for the Solution of Simultaenous Linear Equations.  London:  Nature Magazine,  1878.  1st edition.  Nature, volume 19  `  Royal 8vo.  Very good condition.  Thomson (later Lord Kelvin) along with his brother James devised this early analogue computation device appearing in the December 19, 1878 issue of the great science journal Nature, occupying pp 161-162, the article being approximately 1000-words. We offer the issue, complete, with the original front wrapper and ads, removed from a larger bound volume. Also in this issue appears an interesting book review (of 3-pages) by James Clerk Maxwell, an article on the microphone by P.G. Tait (Thomson & Tait!), as well as a number of other interesting entries. The whole issue comprises 25pp. An article of the same title appears in the Proceedings of the Royal Society in 1879. James Thomson's article "On an Integrating Machine Having a New Kinemtic Principle" appears two years earlier, 1876, in the same journal.   $450.00