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The calorimeter will be useful for measuring heat flux in the range 0.1 - 10 W/cm^2 from such sources as flammable liquid fires. Shortcomings of existing methods are considered, and desirable characteristics for the new instrument are enumerated. Descriptions of the new calorimeter design and its advantages are given, together with its construction, performance under fire-test conditions, and its principal characteristics. A further possible development is described which will permit the heat retained by the calorimeter to be determined in its two component parts radiation and convection.