Petersburg 27th July 1819
I take the liberty to send you the inclosed circulars, and would esteem it a favour, if you found it convenient to afford me information in regard to any of the particulars mentioned. About two months ago I gave your pocket sextant to Captain Bernard Peyton of Richmond who has since informed me it was forwarded to you. I received the greatest benefit from it in surveying the rivers—
DLC: Papers of Thomas Jefferson.