(1809-1862) Union major general who ordered the raid that would become known as the 'Great Locomotive Chase', died of yellow fever early in the war. A renowned astronomer, he developed the first magazine in the U.S. dedicated to astronomy and was instrumental in building an observatory now named after him in Cincinnati. Good content A.L.S., 3pp. 8vo., Sharon Springs, NY, June 10, 1859, to J.W. Oleuto[?] regarding a recent move he made as well as astronomy measurements. In part: '...it gives one great pleasure to announce that I reached this place with Mrs. Mitchel and my family on yesterday afternoon. We are already on the lands of Dr. Green and we anticipate great benefit from the sulfurous water and from the baths... I met, at Utica, Dr. Wolworth who told me something about the expression[?] of one number of Gould's formae, about which harries some mystery. I saw his notes of this pattern in the May no. 3...but fares no attestation to it. Presumably, it is a trick of some sort. I wrote to Albany to Santos for some measures...I write in the plural as the instrument for Cincinnati and Albany will be ordered...at the same time. I have the time recording apparatus on in the hands of the [?], Four sets of the machine one under way...they will want a fit for Ann Arbor...' Sold with an engraving. Light ink stains, else fine condition. It is possible that Mitchel is referring in this letter to work on longitudinal measures to define the positions of stars in the sky, which is regarded as one of his greatest contributions to the field.