City of Washington, March 21st. 1806.
Having constructed a table on the same principles with the inclosed, to every quarter of an hour between 0 and 12 hours, for bishop Madison, of Virginia, I request your permission to present this to you, extended to a less interval, and accompanied with a rule to reduce even that interval to one minute of time:—the odd seconds may be found by simple proportion. If it is favorably received by you, as a small testimonial of my respect, it will be an ample reward for the labour I have bestowed in the computation.
I have the honor to be, Sir, with great esteem, Your most obedient servant,
DLC: Papers of Thomas Jefferson.