On the Rapid Production of Steam. 



297 



The 2d, 3d, 4th and 5th experiments, present a remarkable coin- 

 cidence of results, and prove that at the temperature of comparison, 

 nine pounds of wrought iron will generate one pound of steam, under 

 atmospheric pressure. Subsequent series will show, that, but for 

 the caution necessary to avoid waste, this effect might have been 



produced in twenty-five or thirty seconds, instead of the times above 

 noted. 



SECOND SERIES, 



With wrought iron cylinders, 6 inches long, and 1.7 inches in diame- 

 ter; surface, 38 square inches, including that of the hook; water 

 kept at 212°. 



z 

 g 



'o 



— * 



> 



o 



1 



2 

 3 

 4 



5 



6 



m 



C 



- 



7 



62.5 



02.5 

 62.5 

 62.5 



63 



63 



8 



63 



63 



63 



10 

 11 



62.5 

 63 



12 (i3 



13 

 14 



62.25 

 62.25 



m 



a 

 o 



a 





42 



45 

 45 



48 



120 



120 



p 

 EL 



a 



3 



Q 



c 



3 



o 



c 



rt 



s 



1 



1 



5.25 

 5.5 



7 



120 



120 



80 



90 

 1 50 

 150 

 100 

 120 



7 





o . 



5 S 



93 



<u c 



e o 



3 



o 



.0640 



.00 10 

 .0840 



.0880 



.1111 



.1111 



7 



.1111 



.1111 



l.Kb 



8 

 8 



9.5 

 10.5 



.1150 



.1240 

 .1270 

 .1270 

 . 1 365 

 . 1 680 







en 



o 



- 



3 



o 



o 



CJ 



3 



3 

 O 



a 



HEAT OBSERVED 



15.625 



15.025 

 11.904 

 11.363 



9.000 



9.C00 



9.000 



9.000 



8.689 



7.875 

 7.875 

 0.552 

 5.928 





Black. 



Black. 

 Black. 

 Black. 



Dull red; com- 

 parative temp. 

 Dull red ; com- 

 parative temp. 

 Dull red ; com- 

 parative temp. 

 Dull red; com- 

 parative temp. 

 Dull red; com- 

 parative temp. 

 Fair red. 

 Fair red. 

 Fair red. 



Full red. 

 Bright red. 



REMARKS 



Iron immersed 



Do. 

 Do. 

 Do. 



at once 

 do. 

 do. 

 do. 



Do. by degrees. 



Do. 



do. 



Do. 



do. 



Do. 



do. 



Do. quickly but 



not at once. 



Do. 



do. 



Do. by degrees. 

 Do. do. 

 Do. at once. 

 Do. do. 



The striking correspondence in the results of those experiments in 

 the above series, which purport to have been made at the compara- 

 ble temperature (No.'s 5, 6, 7, 8 and 9) with the analogous ones in 



fi 



wrou 



iron at a dull red heat, bears a direct relation to the weight of metal, 

 being one pound of steam to every nine pounds ol iron. 



