I finally made it into what’s left of this asylum in Massachusetts.   Didn’t have much time, but was able to see the covered hydro-therapy tubs.  These were canvas covers that kept a patients body fully submerged, while allowing their heads to protrude on one end. 

Day Room Chairs
Patient Room
Patient Room Door
Patient Room Door
Hydro-therapy Tubs
Hydro-therapy Room
Hydro-therapy Control Panel