Chat. XVII.
MACHINES FOR RAISING WATER.
1197
that of an angle of24° 21'. In Spain the Noria is usu-ally furnished withearthen pitchers,between two ropesin place of a chain.
The Cellular Pumpsare of this kind,and when stuffedcushions are usedinstead of pistons,they are termedPaternoster pumps.
Chapelet , workedby Horses , at thebridge of Orleans.
Twelve horses wereemployed at onetime, making 140turns per hour; butas some allowanceis necessary forchanging, we canonly calculate upon120: the numberof cogs upon thewheel was 115, thatof the great lantern12, that of the small8, making in all9660 buckets of ^water delivered per Fig . 18G4. chapelet at the bridge op Orleans.
hour from each of the two chapelets : the heights of the buckets were 6 inches, their dis-tance apart 6 inches, and the width of the trough inches.
Chapelet worked by a Water-wheel , at the bridge of Orleans. When the water was 18inches above low water, the great wheel made 165 turns in an hour, which gives about 2
V
Fig. 1805.