In his final moments, Blue spoke out to murdered Carmen's daughter Terrella Richards.
AGONY 3 Terrella Richards with a picture of mum Carmen, killed by Blue
AGONY Z Terrella
Richards with picture of mum Carmen, killed by Blue
To prove his theory, he built his own "world in a glass box," or a terrella
, a vacuum chamber in which a small magnetized metal sphere (a stand-in for Earth) is bombarded by electrons injected into the box.
James miraculously traps a strange light known as "The Breath of God" in a terrella
, a small globe kept around his neck.
Gilbert shapes a rounded magnet on his lathe and calls it a terrella
(Latin for "little Earth") because it represents for him the earth's prefallen state.
The book discusses his very advanced terrella experiments, where he practiced creating artificial auroras.
However, it was not a result of his terrella experiment, as Jago states, but through electric discharges in gases.
By moving a small compass across the surface of the terrella
, Gilbert could reproduce all compass needle behaviors observed around the earth--not just the tendency of a horizontal needle to point north but also the inclination of the needle to the vertical, as observed by Norman.