Paper, 'On the construction of a new calorimeter for determining the radiating powers of the surfaces; and its application to the surfaces of various mineral substances' by W [William] Hopkins 73 manuscript pages including one figure and seven separate plates. Subject: Scientific Instruments Published in Philosophical Transactions as 'On the construction of a new calorimeter for determining the radiating powers of surfaces in air; and its application to the surfaces of various mineral substances'. Received by the Royal Society on 1 June 1860. Read 21 June 1860. Abstract published in Abstracts of the Papers Printed in the Philosophical Transactions of the Royal Society of London [later Proceedings of the Royal Society of London], Volume 10, 1860. [1860]