. Experiments on Local Heat. In a Letter from James Six, Esq. to the Rev. Francis Wollaston, LL. B. F. R. S.. bove ^ degrees warmerthan that at Dover well. The water at the bottom of thefe wells is, I prefume, toodeep beneath the fur face of the earth ever to be afFefled by thetemperature of the atmofphere; for if the heat of the fummercould have had any influence on either of them, that at Dovei^muft have been moft confiderably afFedled by it, efpecially inthe month of September; and the air was fomething warmerwhen the experiment was made at Dover than at Sheernefs.From the nature of the dif
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. Experiments on Local Heat. In a Letter from James Six, Esq. to the Rev. Francis Wollaston, LL. B. F. R. S.. bove ^ degrees warmerthan that at Dover well. The water at the bottom of thefe wells is, I prefume, toodeep beneath the fur face of the earth ever to be afFefled by thetemperature of the atmofphere; for if the heat of the fummercould have had any influence on either of them, that at Dovei^muft have been moft confiderably afFedled by it, efpecially inthe month of September; and the air was fomething warmerwhen the experiment was made at Dover than at Sheernefs.From the nature of the different kinds of (Irata in which thefewells are dug, had they been in all other circumftances thefame, one might reafonably expe£t to find the warmer fpring inthe chalk, and the colder in the clay; but here the reverfe isfeen, without any apparent local caufe, except the differentelevations of the fprings in refpe6l to the level of the fea« I am^ &c« JAMES SIX Cant^rburj-jA-uguft IJ 1787^ TABLE on local Ileat^ ..4 I < A Ix iJ S~.J -L.^ i» Thermoineters at^diiterent ftations Gompared togetIiei-%. Morning* + 3 Partly clear. + Z ICloiidy. Partly dear. Partly clear* Partly clear* v^ie3r» Clear, v^iejij • Cloudy. Cloudy, Showery. Sho«A^ery. Showery, Cloudy, Clear.Partly clear, v-ieti* •Partly clear. Clear.Cloudy. Mifty rain. Clear, Cloudy, Cloudy, Raio»Rain.Cloudy, Cloudy* Cloud J. Afternoon. Clear, Cloudy, Rain withhciu» Evening. Clear.Cloudy, Clcfl r. PartlycleanRain. Cloudy, v^iefir*Clear, Partly clear, Clouc Raia, Cloudy. tiaio.Rain. Q0, 0 Q0.2 ^O. I J oo MB 130, 0129*9 I Q I w I ^ y • c^i QLt, XjJxA, V I ill T A R 1 ? K 114. Mr. Six^s ExAermmts TABLE ILThermometers at different ftations compared together. Nighu j Bay. * 1785 ^ Morning, Afternoon. Even-ing, Wind. ? G a 0 •;0 *^ !3 db S . .1 0 - 1 June 0 6 0 I , ° 0 © In. I 47 46 + J 1 65 59 -f 6 Showery* »«« •-«• •XWV MMMO w 29.8 2 47 48 - I 65 61 + 4 Clear. Cloudy, ••m^ mmm N 29.8 3 46 47 .i-I 1 71