MEMOIR OF DANIEL TBEADWELL. 



500 



Load on 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 QQO 



Whole weight, 83,030 Ik 



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 evaporate one cubic foot of water. Out, 1.00 cubic 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. £3fp= 122.8 lb. of the resistance shown by the dynamometer from elevating the load; mean draft 

 468.4 — 122.8 = 315.6 lb. of resistance from friction, and VYr*# == --* - 2 J or draft when reduced to a level 

 inhj^ds of the load. Hence 9.32 lb. required to draw one ton of 2,210 lb. 



Return. - 8 § f§£ — 122.8 lb., the tendency of the load to descend by its own weight which was not show d by 

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

 !!$?$ = 247.6; or draft from friction ^S^ths of the load. Hence 9.04 lb. required to draw one ton of 2240 lb. 



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



Framingluun. 



Load or 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 



