Pls describe Callender-Griffith's Bridge and Carey-Phoster's Bridge

Callender- Griffith's bridge an Carey foster bridge are both modified form of wheatsone bridge.Like in meter bridge, carey foster bridge has effective length connected to resistance in series at each end to improve the accuracy of the bridge. It is used to measure small resistances. Whereas Callender griffith bridge can be used to measure the resistance of a platinum at different temperatures.