MEMOIR OF DANIEL TREADWELL. 



511 



I. To obtain from the experiments herein related the effect of the sparker, I take from them the 



following facts : 



1st. Wood and water required in going to and returning from Framingham, 41 miles. 



Sparker on, 



Wood. 



Out, 



83 cubic feet. 



Return, 60 



.. 



a 



143 « 



.. 



Out, 



61 cubic feet 



Return, 40 



.. 



u 



101 



u 



(« 



Out, 



67 cubic feet 



Return, 44 



m 



.. 



U 



» . 



Total 355 cubic feet 



Water. 



53.4 cubic 

 42.5 



Mercury 



feet. 



Sparker off. 



Wood. 



95.9 





.. 





67.0 cubic feet 



48.7 " " 



.» 



115.7 



.. 



.. 



Meteor 



37.50 cubic feet 



81.55 " " 



42.0 cubic feet 

 20.5 " *< 



GD.Oo 



. . 



. . 



02.5 



t » 



. I 



Lion 



53.42 cubic feet. 

 43.35 " 



82.91 cubic feet 

 33 



96.77 " 



* . 



115.91 " 



- ■ 



261.72 cubic feet 



291.11 cubic feet. 



Water. 



52.0 cubic feet. 

 40.0 



93.2 



. . 



It 



>> 



39. 12 cubic feet. 



20.13 " 



^'KOo « 



. » 



.. 



58.^1 cubic feet. 



89.50 " 



98.34 



44 



- . 



251.09 cubic fe.t. 



2d. Time required in going to and returning from Framingham, 41 miles, with the mean draft as 

 shown by the dynamometer. 



Sparker on. 



m. s. 



91 15 out. 

 69 45 return 



Time 101 



50 Mea] 



m. 



s. 



106 



45 out. 



83 



25 return 



Time 190 



10 Meai 



m. 



8. 



89 



45 out. 



72 



45 return 



Mean draft, 414.3 lb 



Mean draft, 232.4 lb 



T.me 162 



30 



Mean draft, 536 lb. 



Mercury. 



Meteor 



Lion. 



Sparker off. 



m. 



75 



B. 



55 out. 



64 15 return. 



Time 139 



1 Mea 



m. 



8. 



89 



40 out. 



63 



return 



Time 152 



40 Meai 



m. 



8. 



92 



40 out. 



70 



40 return 



Mean draft, 407 lb 



Mean draft, 340.4 lb 



Time 163 20 Mean draft, 591 1 lb 



Time required in running the 123 miles with the sparker on, and the same distance without the 



sparker, with the mean draft in both cases. 



Sparker on. 



m. s. 



Time 513 40 



Mean draft 427.6 lb 



Sparker off. 



m. s. 

 455 10 



Mean draft 466.21b. 



Time 



By the above it appears that, although the loads in the parallel experiments with and without thi 

 sparker were almost identical, the draft or traction when the sparker was not used was nine per cent 

 greater than when it was used. I attribute this difference to some slight and accidental difference in the 

 state of the road, or to the condition of the oil upon the journals (or gudgeons), or to both these com- 

 bined. Adding to this nine per cent for the wood and water used when the sparker was on the engine, 

 we find required to produce equal effects, taking the mean of the parallel experiments., about thirty per 





