Wikipedia's Mechanical equivalent of heat article documents Joule's method and result in detail but names no location. Two candidate sources naming a location (a small laboratory at Pendlebury near Manchester, later moved to his Manchester home after the family brewery was sold) could not be fetched: aps.org returned HTTP 403 and a PMC/NCBI commentary article returned a captcha wall.
What would resolve this A fetchable biography or history-of-science source (not aps.org or PMC/NCBI, both currently blocked) confirming Joule's experimental site by name.
OpenHistory of ScienceMechanical Equivalent of Heat (Wikipedia)