510 



MEMOIR OF DANIEL TREADWELL. 



Following the previous method of finding the resistance from friction, the load being 141,306 lb., we have: 



Out. 



14 IS Q6 

 676 



735.4 



209 



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

 526.4 lb. resistance from friction, and J -^|.|° = 268, or draft from friction ^th part of the load. 



Hence, 8.36 lb. required to draw one ton of 2,240 lb. 



Return. 



1A 1 3 o j 



676 



209 lb., the tendency of the load to descend not shown by the dynamometer. Mean draft 



+ 



655.8 lb. resistance from friction, and Wf.i 6 



iV 



^15-T 



-¥h or draf * 



from friction when reduced to level ^l^ths of load. Hence 10.39 lb. required to draw 1 ton of 2,240 lb. 



6. Experiment made November 14, with the Lion, with the sparkcr on the engine, from the depot in 

 Boston to Framineham. 



Load or Train. 



Tender as before. 



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



3 cars loaded with stones and iron 



1 car loaded with apparatus and 2 persons 



33,256 



4.670 



Whole weight, 141,3061b. 



Out. 



1 mile post 

 2 



Time. 



m. s. 



4 55 



4 25 

 3 40 



4 i 



10 



ii 



<< 



11 



i< 



C< 



12 



ii 



II 



13 



ii 



u 



14 



ii 



II 



15 



ii 



it 



16 



ti 



a 



17 



* i 



II 



18 



a. 



ti 



19 



(4 



ic 



20 



11 



3 45 

 3 30 



3 3 l 



Depot in ) 



Framingham £ 



2 35 



Time . 



1 29 45 



Mean 

 Draft. 



1219 



1114 



6U 



731 



702 



89 45 14,382 



685 



Return. 



To 20 mile post 

 19 



.. 



.. 



a 



u 



a 



II 



II 



ii 



Time. 



m. s. 



2 50 



3 10 



3 15 



4 15 



5 10 



2 50 



2 57 



3 18 



.. 



i< 



3 30 



II 



II 



Depot 

 Boston 



in 



3 



25 



2 



55 



3 



55 



72 45 



Time 



1 12 45 



M ean 

 Urait. 



225 



990 

 950 



398 



324 



400 

 97 



8,127 



°87 



Remarks. 



Wind light from the north 



Wood used, being pine of ordinary quality. Out, 67 cubic feet. Return, 44 cubic feet. 



Water used. Out, 53.42 cubic feet. Return, 43.35 cubic feet. 



Wood used to evaporate one foot of water. Out, 1.25 cubic feet. Return, 1.01 cubic feet. 



Following the former method of finding the resistance from friction, the load being 141,306 lb., we have : 



Out. 



_ 3JL5. 

 6T6 



685 



209 



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

 476, resistance as reduced for a level, and * 4 4 V a 0<? — 296.8 ; or draft when reduced to a level 



-^-f^ths part of the load. Hence, 7.55 lb. required to draw one ton of 2,240 lb. 



Return. 



14J3CLS. 

 6T6 



209 lb., the tendency of the load to descend not shown by the dynamometer. Mean draft 

 shown by dynamometer 387 + 209 = 596 lb. resistance from friction, and 1 V A ft * = 237; or draft when reduced 



for a level ^ T th part of load. Hence 9.45 lb. required to draw one ton of 2,240 lb. 



Note. 



durin 



a 25 horse-power. From the experiments up and down, it appears that the load 63 tons would be drawn over a level 20£ 

 miles with 60 cubic feet of wood. Cost at §6 a cord, $2.81. Then one ton drawn over a level one mile at an expense for wood 

 of 2}th mills. 



