MEMOIR OF DAXIEL TREADWELL. 



507 



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

 load being 91,795 lb., we have: — 



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

 569 — 135.8 = 433.2 resistance from friction, and ^'^ =211.9; or draft when reduced for a level ^J^^ths of 

 the load. Hence 10.57 lb. required to draw 1 ton of 2.240 lb. 



Ketum. -^fl^ = 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. resistance from friction, and ^,5^'^ = 183.3, 

 or draft when reduced for a level x^^f^ds of the load. Hence 12.2 lb. required to draw 1 ton of 2,240 lb. 



3. Experiment made, October 28, with the Meteor, withthe sparker on the engine, from the depot in 



Boston to Framingham. 



Lo-\D OR Tr.\ix. 

 Tender No. 4. 



8 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 



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 

 have: — 



Out. ^S|i = 122 3 lb. of the resistance shown by the dynamometer from elevating the load. Mean draft, 

 433.5 — 122.8^310.7 lb. resistance from fiiction, and '/(j'f = 267; or draft when reduced to a level yj»th 

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



Return. ^IyI''^ =: 122.3 lb., the tendency of the load to descend which was not sliown by the dynamometer. 

 Mean draft shown by the dynamometer 231.4 -j- 122.8 =: 354 2 lb. resistance from friction, and ^j^S := 234.4, 

 or draft from friction when reduced for a level ^J^ths of the load. Hence 9.55 lb. required to draw one ton of 

 2,240 lb. 



