1Robert Fulton to Thomas Jefferson, 28 March 1810 (Jefferson Papers)
I send you a sketch of a self acting Bélier Hydraulic it will be necessary to make it with care...
2Enclosure: Robert Fulton’s Drawing and Description of a Self-Acting Hydraulic Ram, [ca. 28 March] 1810 (Jefferson Papers)
That this engine may act well the valve at A must at the commencement open quick as by a stroke,...