At this time, Bullock invented a shingle-cutting machine, but his business went broke when he was unable to market it.

Bullock returned to New York and designed such devices as a cotton and hay press, a seed planter, and a lathe cutting machine.

The press was self-adjusting, printed on both sides, folded the paper, and a sharp serrated knife that rarely needed sharpening cut sheets with rapid precision.

On April 3, 1867 he was making adjustments to one of his new presses that was being installed for the Philadelphia Public Ledger newspaper.

[3] 38,200 April 14, 1863 Printing press to use a continuous web or roll of paper, the first machine built especially for curved stereotype plates.

"... for cutting paper from a continuous roll into sheets" [6] 100,368 March 1, 1870 (posthumous) Improved Machine for Planing and Squaring the ends of Segmental Stereotype Plates "...