MS-513 PVG RHEOSTAT

Four tube, open type Resistance 100 ohms current 5 A consist of a
layer of resistance wire wound on an insulating, heat resistant
porcelain tubes supported on metal feet. A brass sliding contact
supported by bakelite rider moves on brass rod. Nine 4 mm. socket
terminals, one connected to the sliding contact and others to the
ends of winding. Resistance 100 ohm current 5 A