Niépce and Daguerre went into partnership after discovering their common interests in inventing a permanent form of photography. The engraver Lemaître or the lens-maker Chevalier, both known to Daguerre, may have made the introduction: both assisted Niépce in his experiments. Niépce visited Bauer in Kew in 1827 and presented him with what is generally regarded as the first photograph. Claude was Niépce’s brother — they jointly developed the pyréolophore (1806), the world’s first internal combustion engine. Carnot was impressed by the Niépces’ hydraulic machine but told them another plan had been chosen.