The aluminium moulded or bakellite support tight the pipe on each side with
rod and nuts. Pipe are made from special
porcelain. The guide rod carrying contact block is tightened with screws to the
projection of the supports.
The sliders are provided with Phosphorous-Bronze contact. These have double contact system and
move
perfectly smooth on the sliding rod. Three brass terminals are provided. One
terminal being connected to the
sliding contact and the other two to the ends of
winding enabling the unit to be used as a rheostat or potentiometer. The
layers
of electrically oxidised Eureka wire wound on insulating heat resistance
porcelain pipe according to the length
required. Total resistance
and max. current capacity is marked on the
sliders.