204
from which may be deduced the necessary datafor calculating the effects upon other planes.
EXPERIMENT XIV.
Upon the Killingworth Rail-road : self-act-ing plane with a single sheeve, round whichthe rope winds, one end of which is attachedto the descending, and the other to the ascend-ing carriages; length of the plane 715 yards,descent 57 feet 6 inches. Five loaded carriages,each weighing 87641bs., descended by theirgravitating force, and drew up 6 empty car-riages, each weighing 28001bs. on a meanof several times, in 200 seconds; wheels 34inches diameter, axles 2-f inches diameter,size of rope 5 inches circumference, weight3884lbs. The descent of this plane is notregular, being greater at the top than at thebottom, the rails being laid, as shewn in Fig.1. Plate V., the line of road perfectly straight.Number of sheeves in action at once 73,weight 3297lbs., diameter of sheeve whererope runs, 11 inches, and diameter of theaxles \ of an inch, ratio 14.65 : 1 ; weight ofwheel WW 4636 lbs., diameter 10 feet, anddiameter of axle 6 inches, ratio 20:1.
The gravity of the loaded carriages will be