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The Wheatstone bridge is an electrical circuit concept that is often used in metrology to measure unknown electrical resistances. It was named after the British scientist Sir Charles Wheatstone.

A typical Wheatstone bridge consists of four resistors arranged in a square. Two of these resistances are known and constant, one is variable, and one is unknown. By adjusting the variable resistance, the bridge can be brought to a "balanced" state where no current flows through the central part of the circuit. In this balanced state, the unknown resistance can be calculated by the known resistances and the ratio of their values.

In terms of bulk material sampling, the Wheatstone bridge can be used in various contexts. For example, it could be used in sensors or measuring devices integrated into the sampling equipment to measure physical properties of the bulk material, such as weight, pressure or temperature.

It is important to note that the Wheatstone bridge can only provide accurate measurements if it is correctly calibrated and balanced. This usually requires a certain amount of technical knowledge and experience.