MEMOIR OF DANIEL TKEADWELL. 



515 



ExPERIjrEKT No. 1. 



ExPESDlEhT No. 2. 



Jlean draft of whole distance 119.4 



These experiments were made during a strong west wind. 

 Tuesday, November 1st. Run through the above distance with the engine Lion drawing the cars 

 as described in the foregoing experiments. Experiment Xo. 3 gives the account when the cars with large 

 gudgeons was tried. Experiment No. 4 gives the account when the car with small gudgeons was tried. 



Experiment Xo. 3. 



EXPEEIMEST No. i. 



Mean draft of whole distance 110.3 



The car used in experiment No. 4 had immediatelj- before this trial run thirteen miles upon the road, 

 bv which the gudgeons and boxes had become warm, and the oil and tallow used upon them softened. 

 Considerino' this as affecting the experiment by reducing the resistance. I made a trial with the same 

 car, on Eriday, November 4th, taking the car and load after it had been at rest and the gudgeons and 

 boxes were cold. 



Experiment made Friday, November 4th, with the engine Jupiter drawing the car tried in Nos. 2 

 and 4, the gudgeons and boxes being cold. 



The rise to Newton Corner is 45 feet. Distance 6J miles = 33,000 feet, which is one foot in 733. 

 Then we have the load carried in Nos. 1 and 3 — 15,820 lb. -^733 = 21 .G lb. — as the resistance from 

 elevatinff the load 45 feet in 33,000, and the load used in Nos. 2, 4, and 5 — 13,880 -h 733 = 18.9 lb. — 



