The Analytical Theory of Heat

according action analysis apply arbitrary becomes body cause coefficient common condition conducibility consider constant contains continually cooling corresponding curve definite denoting depends derived determine differential direction distance effect equal equation escapes evident expressed external extremely fact fixed flow function give given Hence included increase infinite initial temperature instant integral interior known less limits maintained manner mass mean measure molecules movement of heat multiply nature necessary observed obtain origin parallel passes perpendicular plane preceding prism problem propagation proportional quantity of heat ratio rays receives remark represents respect result satisfies sines situated solid solution substitute successive suppose surface taken temperature theory thermometer unit unknown variable vary versin whole