Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . through into the air-chamber </; the momen-tum imiiarted to the water would be sufficient toIarry it to a hight ,as nmch greater than that of thedescending column as the quantity of water in theformer was less than in the latter ; being, however,forced into the air-chamber, tliis effect was exertedintermediately through the compression of the air,rendering it
Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . through into the air-chamber </; the momen-tum imiiarted to the water would be sufficient toIarry it to a hight ,as nmch greater than that of thedescending column as the quantity of water in theformer was less than in the latter ; being, however,forced into the air-chamber, tliis effect was exertedintermediately through the compression of the air,rendering it more constant. In 1796, Montgolfier, one of the inventors of theballoon, invented the self-acting ram, for which heobtained a gold medal at the French Exposition of1802. This is absolutely automatic, inaintainingits action regularly so loiig as the machine remainsintact or the supply of water holds out. .\ simple form is representeil at 13. This machinediffered from that of Whitehurst merely in the addi-tion of a waste-valve c ; but this altered its entirecharacter, and rendered it practically efficient as awater-raising machine. The water, as before, flows down the pipe b, butthe momentum thus acipiired causes it to raise the. HYDROSTATIC PRESSES. PMI3 3CXV Sa pagt 1150. HYDRAULIC SHAFT-STRAIGHTENER. 1151 HYDROCARBON-BURNER. valve c, shutting off the water as before and causingit to spend its energy in forcing a portion of itselfinto the cliaiul»er d ; but this done the valve dro[is,causing a flow through the |iipe until the water hasgained energy to again raise the valve, when thesame series of events is repeated. C represents the suction-ram ; in this the waterflows from the reservoir along the pipe b c d, havinga ball-valve e ; the water flowing from the reservoirthrough the pipe finally lilts the valve sutticiently toclose the aperture t, sto[)ping the flow while thepipe is discharged through d and creating a vacuumtherein ; the atraosphei-ic pressure on the water in/now
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