His initial grant was for 1500 and he began work on a large difference engine which he believed he could complete in three years. He set out to produce an engine with:
Kanyang unang bigyan ay para sa 1500 at siya ay nagsimulang magtrabaho sa isang malaking pagkakaiba engine na kung saan siya sumampalataya siya ay kumpleto sa tatlong taon. He set out na sa paglikha ng isang engine sa: