Light chamber

Endeavour was a device created by Prince Albert and George MacLeish to combat the threat of Werewolves in the Scottish highlands. They positioned it in Torchwood House were focused the light of the Moon to such a degree that the Koh-i-Noor would amplify its power. Most took it to simply be a telescope as it had the appearance of one. However, if one attempted to use it in this manner, the image was out of focus.

In 1879, after both Albert and George's deaths, Endeavour was used by the Tenth Doctor and Rose Tyler to kill a "Werewolf" that was attempting to infect the Queen. (DW: Tooth and Claw)