FRICTION OF ROPES.

209

139, weight 41731bs., ratio of diameter 16:1,rope 1000 yards, inches circumference,weight 2927 ibs., inclined-wheel same as above.

Five loaded carriages descended the plane,and brought up 7 empty carriages, sameweight as preceding, in 280 seconds.

„„ „ 0408 X5X917

1 Iicorcm G — -= 1328 lbs.

32472

_ 3172X7X917ff =—32472 - =(?8ClbS -

P = 1328 - , 17 , 11)S .

10,5 X 280'

ami 1175 — 686 + 215 + 112=:lG21bs. the friction

of the rope.

The number of carriages, used in practiceupon this plane, are 7 descending against 7ascending; but there is always more thansufficient preponderance.

EXPERIMENT XIX.

Fixed-engine plane, where a steam-engineof 60-horse power is erected, to drag the loadedcarriages up; length 2646 feet, height 154 feet6 inches, descent not regular, being less nearthe top than at the bottom ; line curved laterallyin the middle, forming an arc, the versed sineof which is about 40 yards. Rope-roll similarto A, Fig. II. Plate III., on which the enginewinds the rope, and which, during the experi-

o