One of three large disk shaped computer data storage cartridges. Push switch and lift using handle and it comes out of the protective casing. Label has model type and number on it
A metal pointolite resistance box with large cylinder on top, arc switch, power cable and bulb holder/ power cable. Small plate has inscription on it, with two other plates give instructions. Changing resistance so pointolite bulbs can be powered…
glass dome with brass neck piece and screw hole, possible for suspending an apparatus inside or attaching a tube.
Used as storage cover for friction wheels, ABDNP200255