From Tench Coxe
Treasury Department, Revenue Office, January 7, 1795. “… the House of Whelen & Miller1 propose to set a part a specimen of Salt Petre for the Standard, above or below which they are content to vary the price of 12 50/100 Dolls. It is called rough Salt Petre, and is 10 Ct. below the requisite degree of refinement.”
LC, RG 75, Letters of Tench Coxe, Commissioner of the Revenue, Relating to the Procurement of Military, Naval, and Indian Supplies, National Archives.