The Lost Map and the Pendulum
Foucault's PendulumThe characters transform a purported Templar document into a hunt for a map, then imagine the Pendulum as the instrument that locates the world's hidden center.
increasing
Bearing strength in each event
decreasing
Ardenti's Manuscript

A Claimed Discovery
A mysterious document
Colonel Ardenti presents Belbo and Casaubon with a text he says derives from a Templar treasure in Provins. He interprets it as instructions for a centuries-long plan.
A missing witness
Ardenti disappears, and his briefcase vanishes. The uncertainty surrounding his story invites the editors to fill its gaps with increasingly elaborate explanations.
Locating the Meetings

A Geography of Conspiracy
Reconstructed route
The collaborators assign the document's cryptic places to Tomar, Scotland, Paris, Marienburg, the Balkans, and Jerusalem. Their route grows from associative guesses rather than secure evidence.
A decisive instrument
They propose that a specially chosen map, aligned beneath the Pendulum, will reveal the world's navel. The theory makes a museum exhibit seem like the key to global power.
A False Map Becomes Bait

The Map as Leverage
A concealed claim
Belbo tells Aglie that he knows the map's secret and implies that the answer is astonishingly simple. He does not possess such a map; his performance is a personal challenge.
A dangerous audience
Aglie believes the claim, and the supposed secret draws others into action. The map that never existed becomes an effective instrument of coercion.
During Casaubon's first years at Garamond
After Casaubon and Belbo revisit the document
In the days before Belbo leaves for Paris