Describe Searle’s method of determining the thermal conductivity of a good conductor of heat.

• Specimen bar AB of mean diameter, d, is heated by steam at end A and cooled by water at end B as shown above
• The lagging ensure a constant rate of heat flow
• The setup is left to run for some time until steady temperatures θ₁, θ₂, θ₃ and θ₄ are obtained.
• The rate water flow m kgs^-1 is measured using a cylinder and stop clock.

where k = thermal conductivity of the metal and c_w is specific heat  capacity of water

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