Explain the construction of meter bridge

It consists of a straight and uniform wire of materials like Manganin. The wire is of one meter length stretched along the side of a meter scale AC. The ends of the wire are attached to L-shaped thick copper strips of negligible resistance at A and C. The wire and the L-shaped copper stripes are mounted on a wooden base horizontally. Between the two L- shaped copper strips another thick copper strip D of negligible resistance is fixed so that two gaps are formed. 

 In one gap AD a resistance R whose value is to be measured is connected. In the other gap CD a resistance box S is connected. To complete the Wheatstone bridge the resistances P and Q are formed by dividing the meter bridge wire into parts using a jockey J. Jockey J enables changing of P and Q continuously.

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