Tyndall, John, 1820-1893 · New York, D. Appleton · leaf 539
5) I have placedan instrument, similar in form tothat used by 31. Pouillet, and calledby him a pyrheliometer. Theparticular instrument which younow see is composed of a shallowcylinder of steel a a, filled withmercury. Into the cylinder is in-troduced the thermometer, d, thestem of which is… … piece of brass tubing. like the bit of zinc and copper already referred to, on the top of the lowercylinder of the lamp, was repeatedly made, the dark band being produced.The form described above was given to the experiment, simply to render itsresemblance to the effect of the solar atmosphere more…
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