In brief:
Vrijland (litt: Free Land) is the compound where the Dutch Hackerspace Hack42 was housed until 2020. The Hackerspace rented two stories in a building nearby. The Chapel is in use for weddings, conferences, exhibitions, parties, etc. It is there where I installed a Foucault Pendulum in 2017.
You can find it on Google Earth coordinates 52 deg 02'14.21"N, 5 deg 54'05.84"E. (Koningsweg 31a, Arnhem)
The pendulum has operated here for a few days and was showed to the public during the Hack42 Open Day at october 8, 2017, the "Weekend of Science" when many science related institutions open their doors for the public.
During the preparation the cable broke 2 times. Read the story of the broken cable.....
In the end of 2019 the message came that Hack42 had to move to another location in 2020. So there will be no further attempts to install a pendulum here.
Per 2020 Hack42 has moved to a location on an industrial aera in Arnhem. See Hack42.nl for more info.
Building the setup in the back of the chapel. The Top Mount is hanging off from the balcony at approximately 5.5 meter high.
The plan was to mount the pendulum to a raft of the roof, some 4 meters higher, after it had proved successfull operation.
That plan is not realized.