sentences:  The close conformity to this mathematical form confirmed that these craftsmen must have had a precision compound machine (as opposed to a simple machine) in 550 BC, predating Archimedes by several centuries; prior to this paper, the earliest compound machines were thought to be of Greek origin (e.g., Archimedes' screw).Lu's discovery of the earliest precision compound machines was included in the "Encyclopædia Britannica".Lu continued his interdisciplinary combination of art history and physics with his discovery, with a group of collaborators,
  of man's first use of diamond, in neolithic China.