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Published online by Cambridge University Press: 16 March 2015
These observations were made, at Professor Forbes's suggestion, at the expense of the British Association. They are still continued, and the present notice contains only a first approximation to the solution of the problems which they are intended to give.
The chief aim of the experiments is to ascertain the progress of Solar Heat in the Crust of the Globe, and has no immediate reference to the question of central heat; the depth to which the experiments extend being inadequate to afford decisive results on that head.
page 223 note * At the Observatory a thermo-electric pair of iron and copper wires was sunk along with the deepest thermometer, with a view to test the applicability of M. Peltier's apparatus to this object. Several observations closely agreeing with the thermometer have thus been made.
page 225 note * In order to render the results directly comparable with those in M. Quetelet's excellent paper in the Brussel's Transactions, the French foot and Centigrade degree are employed as unities.
page 225 note † The values of A are 1.164, 1.176, 1.076 in the same order as before.