Chronovisor

The chronovisor was allegedly a functional time viewer described by Father François Brune in his 2002 book Le nouveau mystère du Vatican ("The Vatican’s New Mystery"). Brune is the author of several books on the paranormal and religion.

In the book, Brune relates that the chronovisor was built by Pellegrino Ernetti (1925–1994), an Italian priest and scientist. Although Father Ernetti was a real person, the existence (much less the functionality) of the chronovisor has never been confirmed; its alleged capabilities are strongly reminiscent of the fictional time viewer which features in T. L. Sherred's 1947 science fiction novella, E for Effort.