The guide rod carrying contact black is tightened with screw to projection of the supports.
The sliders contacted with Phosphorous-Bronze contact.
One terminal being connected to the sliding contact and the other two of the ends of winding, enabling the rheostat to be used as variable resistance or potential divider.
These are made in a variety of resistances and different current carrying capacities so as to satisfy every need.
Support consists of bakelite or aluminium moulded support that tights the pipe on each side with rod and nuts.
LssPhillippines Pipes are made from special porcelain.
These have double contact system and move smoothly on the sliding rod. Heavy brass block is provided for smooth movement for long life.
The sturdy construction & good heat dissipation of these rheostat make them ideally for general laboratory use.
Three brass terminals are provided.
Winding wires: The layers of electrical oxidised Constantine wire wound on an insulated heat resistance porcelain pipe according to the length required. Available in Current Rating of 0.6 Amperes to 8 Amperes    

Physics School Lab Equipment Suppliers in India 

Ltekonline are the manufacturers of Rheostat Constantine Wire Electronic and Electric Lab used to demonstrate engineering principles in Engineering Colleges, Engineering Schools and Physics Lab Experiments for Engineering Teaching Lab in Universities