British Journal of Nutrition 39(3),557–566 (1978); DOI10.1079/BJN19780071. Authors M. J. Dauncey, P. R. Murgatroyd and T. J. Cole. The indexed abstract describes a heat-sink direct calorimeter, open-circuit indirect measurements and evaporative heat loss inferred from inlet/outlet wet-and-dry-bulb temperatures and airflow.