Abstract: An isolator for seismic activity including an upper level for supporting an object to be protected, an intermediate level, and a lower level for attachment to the floor or other structure. An interconnection is provided between the upper and intermediate levels to permit relative movement between the levels along a first axis, and a similar interconnetion is provided between the intermediate and lower levels to permit relative between along a second axis perpendicular to the first axis. Each of the interconnections includes one or more bars mounted on one of the levels and defining guide faces oblique to the axis of movement, and a lever pivotally mounted on the other of the levels with a roller for engaging the guide faces, with a spring biasing the roller toward the guide faces. The interconnection also includes tracks and bearings riding on the tracks to provide the interface movement between the levels.

Abstract: A display case for supporting and viewing of a museum piece, the case including a base providing a lower chamber for a humidity buffer and a transparent cover providing an upper chamber for the piece on display. The case is substantially airtight, with sealed access ports in the base for inserting and removing humidity buffer containers, and with a clamped soft seal between the cover and base for removal of the cover to provide access to the display space. In the preferred embodiment, the humidity buffer is contained in cylindrical containers which rest on a sloping shelf in the base for ease of handling, and the lower and upper chambers are separated by a platform which provides a restricted airflow path between the chambers so that opening an access port does not result in substantial airflow into or out of the upper chamber.