MEMOIR OF DANIEL TREADWELL. 



509 



Load ok Train. 



Tender as before. 



3 cars loaded with iron rails Weight, 68,920 lb. 



1 car loaded with stone 9,210 



1 car carrying apparatus and 3 persons 4,900 



AVhole weight, 83,030 lb. 



Wood used, being pine of ordinary quality. Out, 42 cubic feet. Return, 20.5 cubic feet. 



Water used. Out, 39.42 cubic feet. Return, 20.13 cubic feet. 



Wood required to evajiorate one cubic foot of water. Out, 1.0(3 cnliic feet. Return, 1.02 cubic feet. 



Following the former method for finding the resistance from friction, the load being 83,030 lb., we have: — 



Out. S|!J|a = 122.8 lb. of the resistance shown by the dynamometer from elevating the load; mean draft 

 468.4 — 122.8 = 345.6 lb. of resistance from friction, and y^'^^^ = 240.2 ; or draft when reduced to a level 

 ^^j^^ds of the load. Hence 9.32 lb. required to draw one ton of 2,240 lb. 



Return. ^Iff^ = 122.8 lb., the tendency of the load to descend by its own weight which w.as not shown by 

 the dynamometer. Mean draft shown by the dynamometer 212.5 -)- 122.8 = 335.3 lb. resistance from friction, and 

 Wy,^ = 24T.G; or draft from friction ^J^S^ths of the load. Hence 9.04 lb. required to draw one ton of 2,210 lb. 



5. Experiment made November 2, with the Lion, without the sparker, from the depot in Boston to 

 Framingham. 



Load on Train. 

 Tender as before. 



12 cars loaded with iron rails Weight, 103 380 lb. 



3 cars loaded with stones and iron 32,256 



1 car loaded with apparatus and 2 persons 4,670 



Whole weight, 141,306 lb. 



Wood used, being pine of ordinary quality. Out, 82.91 cubic feet. Return, 33 cubic feet. 



Water used. Out, 58.84 cubic feet. Return, .59.5 cubic feet. 



Wood used to evaporate one cubic foot of water. Out, 1.41 cubic feet. Return, 0.84 cubic feet. 



