Before revision: A dissipator in building design, is a device mounted among some elements of a building; during an earthquake they are subjected to movements which are relative to each other (for instance you can think of the relative movement between two different floors).
After revision: A dissipator in building design, is a device mounted among some elements of a building; during an earthquake they are subjected to movements which are relative to each other (for instance , the relative movement between two different floors).