Co-kus Effccls-ofthc l),q,:,-fea tnwfvujf^o,] of H, ,. 3^ , 



up fed « hen, on running the ends of his fihgers into the fand beneath the water, he found 

 h heat qu.te.ntolerable. The fand was perfeftly wet, and yet the tempera.. re wsfo 

 V ry different at the fn.all diftance of two or three inches ! He even found fhat the flfa 

 of the fand was to allappearance quite as cold as the water whieh flowed over it He cou d 

 not reconcile th:s to the f.ppofed great conduaing power of water ; and then for tefirft 

 t.rne, ,„ confequence of his doubts refpeding the exiftence or intenfity of this power Le 

 determtned to make experiments to afcertain the fad. Thefe however were H f . I 



In ,l,„ou,fe or .t„ of .»p,™„,. „„ ,,„,, Co.,„ R. faj „„,fo„ ,„ .f, ^, 



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cl ed, he nfing current occupied the uppermoft fide, and the defcending ftrcam th lower 

 Ihe velocities were perceptibly increafed by wetting the tube with ice col^^ ' Z 

 ecame gradually lefs as the thermometer was coolect, and ceafed whe^ th tid "ad c'! 

 quir.d he common temperature of the room ; and the motion was grea-ly prolonged vvhc, 

 U.e cooling of the bulb was impeded by wrapping it in furs or any ft her larm clveri ' 



The fame experiments, with motion of the fame kind, and quite as rapid, were repeated 

 with a fimilar thermometer filled with linfecd-oil. "e repeated ^ 



Frotn thefe fa£ls Count Rumford was led to conclude that the fluids he had tried and 

 probably al, others, are in fad non-condu^ors * of heat, that they tranfmit thismatter 

 W?"".^'r' "■'' """* '''""'''' "^"J'' "^' ^""'"^ ^f''^^' °f «"i'l=. -"i pmicuhrly water as ,.r-, 

 I"!^: S^IC::"" "" "'"f —'-f: °f "- ""<?^'^" a line of pa..,, ok «Z1 ^ j! 



P p 2 



