28 Reynolds AMD Moorby, Equivalent of Heat. 



The several circumstances on which the accuracy of 

 the results of the investigation depends, together with the 

 relative limits of error as determined for each circumstance, 

 and the formulae of the relative corrections to be applied, 

 are as follows : — 



( 



Z:ircumstaiices and Formulee of Correction. 



Outside Limits of Relative 

 Errors. 



I. 



Terminal diiferences in the moments 

 of momentum of the water in the 









brake 



O'OOOOOO, 



-O'OOOOOO 



2. 



Cyclic fluctuations of speed of the 









engines 



0-000025, 



- 0-000025 



3. 



Work done on the water by end-play 









of the shaft... 



0-000017, 



- O'OOOOOO 



4- 



Work done in the dash-pot 



O'OOOOOO, 



- o-oooooo 



5- 



Effect of the automatic gear on the 









balance of the brake 



0-000016, 



-o-ooooi6 



6. 



Imperfect elimination of the error of 









balance of the brake 



O'OOOOOO, 



- O'OOOOOO 



7- 



Imperfect elimination of the heat 

 conducted by the shaft 









-cs(T|-Ty/i:(H) 



O'OOOOOO, 



- O'OOOOOO 



8. 



Imperfect elimination of the heat 

 radiated from the brake 









-Ri:(T^-T"J/S(H) 



O'OOOOIO, 



-O'OOOOIO 



9- 



The engagement of the counter 









+ 0-000013 



O'OOOOOO, 



- O'OOOOOO 



10. 



The terminal difference of speed and 

 temperature 









- i:{(B + W,)T^ - (B + W^)T;}/2(H) 



O'OOOOOO, 



- O'OOOOOO 



II. 



Leakage of the stuffing-box ; 









-SW,3(Tr^-T0/2(H) 



O'OOOOOO, 



- O'OO0O25 



12. 



Leakage at the automatic valve, 









O'OOOOOO 



O'OOOOOO, 



- O'OOOOOO 



13. 



Imperfect elimination of water lost 









by evaporation 



O'OOOOOO, 



- O'OOOOOO 



14. 



Limits of accuracy in weighing the 









water 



0-000025, 



— 0*000025 



15- 



Weight of the atmosphere, - 0-001204 



O'OOOOOO, 



— O'OOOOOO 



16. 



Correction for gravity to latitude 

 of Greenwich 







