The Analytical Theory of Heat

according action analysis apply arbitrary axis becomes body co-ordinates coefficients common condition conducibility consider constant contains continually cooling corresponds curve definite denoting depends derived determine differential direction distance effect enter equal equation escapes evident expressed external extremely face fact fixed flow function give given Hence included increase infinite instant integral known less limits maintained manner mass means measure molecule movement of heat multiply nature necessary obtain origin parallel passes perpendicular plane powers preceding prism problem propagation quantity of heat ratio rays receives remains remark represents respect result satisfies sines situated solid solution substitute successive suppose surface taken temperature theory unit unknowns variable vary versin whole