190

FRICTION OF CARRIAGES

Edge-rail of Losh and Stephenson’s patent,2~ inches broad at top. The carriages wereallowed to descend freely by their gravitatingforce, and the space they passed over ascer-tained by a stop-Avatch.

EXPERIMENT V.

Four loaded carriages, each weighing 9408 lbs. with case-hardened wheels, two feet eleven inches diameter, malleableiron axles, three inches diameter, bearings cast iron, fournches broad.

Space described 1164 feet—time 120 seconds.

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By theorem B. I —O -= 216lbs. the friction of the

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216

our carriages, and —— = 43lbs. the friction of each carriage.

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EXPERIMENT VI-

Seven loaded carriages, similar to the above, describedprecisely the same space, in the same time, making theirfriction the same as the above, viz. 43 lbs.

During the time of performing these two experiments, itwas a dead calm, not the least wind ; and the rails were dry,and in that state which would present almost the lonst

resistance to the wheels.

EXPERIMENT VII.

Same plane, with one loaded carriage, similar to the pre-ceding, space described 1266 feet, time of descent 128seconds.

By Theorem B. as before

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I'~G- —~4. r >\\>. the friction.

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