Osborne Reynolds And W.H.Moorby (Phil.
This Variation May Have Been Due To The State Of The Lagging, Which Moorby Distrusted In Spite Of The Great Reduction Of The Heat Loss, Or It May Have Been Partly Due To The Difficulty Of Regulating The Speed Of The Engine And The Watersupply To The Brake In Such A Manner As To Maintain A Constant Temperature In The Outflow, And Avoid Variations In The Heat Capacity Of The Brake.
It Appears Probable That His Values For Higher Temperatures May Be Adopted With This Reduction, Which Is Further Confirmed By The Results Of Reynolds And Moorby, And By Those Of Liidin.
The Value 4.180 Joules At 20° C. Is The Mean Between Rowland'S Corrected Result 4.181 And The Value 4.179, Deduced From The Experiments Of Reynolds And Moorby On The Assumption That The Ratio Of The Mean Specific Heat O° To 100° To That At 20° Is 1.043'6, As Given By The Formulae Representing The Results Of Callendar And Barnes.
In Any Case It May Be Remarked That Formulae Such As Those Of Jamin, Henrichsen, Baumgartner, Winkelmann Or Dieterici, Which Give Far More Rapid Rates Of Increase Than That Of Regnault, Cannot Possibly Be Reconciled With His Observations, Or With Those Of Reynolds And Moorby, Or Callendar And Barnes, And Are Certainly Inapplicable Above Loo° C.
Moorby, gives 778 as the mean value of Joules equivalent through the range of 32 to 212 F.