The Philosophoscope is a binocular telescope that is activated with the Philosophoscope Key.
History[]
The Philosophoscope was created by Harland Locke.[1] It is located in the west side of Keyhouse Manor in the tower facing the entrance.[2][3] It was used in 1915 by Chamberlin Locke to find John Locke, after discovering his attempt to join the Allied forces in World War I, by the "Grave Hazzyrd" setting. John later identified Fiona Locke as his "Usefullest Soulle" in obtaining the other keys.[1] The Philosophoscope was later knocked over by Chamberlin using the Giant Key to close the door to the sunken Titanic after John used the Anywhere Key to drown himself.[4]
In World War II, the Philosophoscope confirmed to Jean Locke that Hans Riffel was her "Truest Love", proceeding their romance.[3]
In 2012, Dodge used the Philosophoscope to spy on Keyhouse Manor.[5] He uses it to supposedly find out who an "Untrustworthy Ally" is, and ends up spying on Rufus (whom he now believes to be said untrustworthy ally) and Sam Lesser (who is the real Untrustworthy Ally but cannot be seen by the Philosophoscope while he is a ghost).
The Philosophoscope was most likely destroyed when Keyhouse burned down in the spring of 2012.[6] It is unknown if Tyler and/or Duncan rebuilt the Philosophoscope or if it was magically repaired when Tyler created the new Keyhouse with the Keyhouse Key.[7]
Properties[]

Keys to the Kingdom #4
The Philosophoscope has a dial switch with five settings on it. The device will show to its user the person who best fits the desired category.[5] The settings are as follows:
- "Beste Teacher" (Best Teacher) - The person who can guide the user.
- "Truest Love" - The person who is most important to the user.
- "Usefullest Soulle" (Most Useful Soul/Person) - The person who can facilitate the user's cause.
- "Untrustworthie Ally" (Untrustworthy Ally) - The person who will bring the downfall to the user.
- "Grave Hazzyrd" (Grave Hazard) - The person who will cause misfortune for the user. This setting is subject to misinterpretation, as it can refer to what the person can do to endanger the subject's current interest, though it does not mean the person themselves are a threat.[1]
While there may be more settings, these appear to be the only ones. The Philosophoscope's power is unlimited by the person's physical state, being able to detect the presence of ghosts and spirits, albeit they will not appear in the scope's lens when detected.[5]
Info[]
References[]
- ↑ 1.0 1.1 1.2 Locke & Key: ...In Pale Battalions Go... #1. August 26, 2020
- ↑ Locke & Key: Grindhouse. August 29, 2012
- ↑ 3.0 3.1 Locke & Key: Guide to the Known Keys. November 23, 2011
- ↑ Locke & Key: ...In Pale Battalions Go... #3. December 16, 2020
- ↑ 5.0 5.1 5.2 Locke & Key: Keys to the Kingdom #4, "Casualties". January 9, 2011
- ↑ Locke & Key: Alpha #1, "Omega & Alpha", September 11, 2013
- ↑ Locke & Key: Dog Days/Nailed It. November 6, 2019