To Aaron Ogden, 9 May 1800
NY. May 9. 1800
You will provide without delay three pendulums to vibrate seventy five, one hundred, and one hundred and twenty times in a minute—Col. Smith wrote to me some time since that he was making a provision of this kind—You will ascertain
what he has whether he has done this, and if he has, measure provide make such provision only as will supply the deficiency
(Df, in the handwriting of Thomas Y. How, Hamilton Papers, Library of Congress).