MEMOIR OF DANIEL TREADWELL. 



507 



Out. 



1 mile post 

 2 



u 



a 



a 



a 



a 



w 



" 11 



a 



u JO 



u 



" ii 



u 



" H 



u 



" 15 



u 



" 16 



(4 



" 17 



<( 



" 18 



u 



" 19 



u 



" 20 



(4 



To Depot 



Framiii 



igham 



Time . 



Time. 



m. 



3 85 



3 35 



2 45 



2 45 



74 55 

 1 14 55 



Moan 

 Draft. 



736 



477 



565 



11,951 

 1 569 



Return. 



a 



it 



20 mile post 

 II) 



. . 



it 



. . 



<( 



. . 



.. 



<< 



. . 



Depot 

 Boston 



Time 



Time. 



30 



3 50 



3 15 



64 15 

 4 15 



Mean 

 Draft, 



1 53 



217 

 225 



7,673 



Remark* 



Following the method pointed out in the preceding experiment for finding the resistance from friction, the 

 load being 91,795 lb., we have: — 



= 135.8 lb. of the resistance shown by the dynamometer from elevating the load. Mean draft, 

 13.2 resistance from friction, and ^VW =211.9; or draft when reduced for a level • 5 1 l '^ths of 



Out. 



6T6 



569 



135.8 



the load. Hence 10.57 lb. required to draw 1 ton of 2,240 lb. 



Return, ai^jl 



135.8 lb., the tendency of the load to descend which was not shown by the dynamometer, 



Mean draft shown by the dynamometer 865 X 135.8 = 500.8 lb. r 



tf 



183.3, 



tW 



Hence 12.2 lb. required to draw 1 ton of 2,210 lb. 



3- Experiment made, October 28 



Meteor 



Boston to Framinghain. 



Load or Train. 



Tender No. 4. 



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



1 car loaded with stone . . . . 

 1 car carrying apparatus and 3 persons 



9,210 

 4,900 



Whole weight, 83,030 lb. 

 Wood used, being pine of ordinary quality. Out, 61.3 cubic feet. Return, 40 cubic feet. 

 Water used. Out, 37.55 cubic feet. Return, 31 35 cubic feet. 



Wood used to evaporate one cubic foot of water. Out, 1.63 cubic feet. Return, 1.27 cubic feet. 

 Following the method before denoted for finding the resistance from friction, the load being 83,030 lb., we 



h 



ave: 



Out. 



JLS 3 0. 

 6?6 



433.5 



122.8 



= 122 3 lb. of the resistance shown by the dynamometer from elevating the load. Mean draft, 

 310.7 lb. resistance from friction, and |ty£f = 267 5 or draft when reduced to a level ^ T th 



of the load. Hence 8.33 lb. required to draw one ton of 2,240 lb. 



Return. 



.8_3 3Q_ 

 6T6 



dynamomet 



+ 





234.4, 



or draft from friction when reduced for a level sHT ths of the load - Hence 9 - 55 lb - re q uired to dra w one ton of 

 2,240 lb. 



