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 . et-wheel I-; the movement of this wheel causesone of its teeth to lift the tail of a pivoted hammersounding a signal on the bell h. Pneu-matic Trough. The pneumatic trough,with its jars for the collection of o Fig. 3855. gases, is the in-vention of Caven-dish ;itis gener-ally credited toPriestley. Thejar, filled withwater, restsupon the shelf,and the b
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 . et-wheel I-; the movement of this wheel causesone of its teeth to lift the tail of a pivoted hammersounding a signal on the bell h. Pneu-matic Trough. The pneumatic trough,with its jars for the collection of o Fig. 3855. gases, is the in-vention of Caven-dish ;itis gener-ally credited toPriestley. Thejar, filled withwater, restsupon the shelf,and the beak ofthe retort ex-tends beneath the shelf, so that the gas passing offfrom the retort passes up into the jar and displacesthe water therein. Pneu-matic Tube. To the fertile brain of of Blois, who lived about the end of the sev-enteenth century, we are indebted for the first sug-gestion rf conveying parcels in a tube by means ofcompressed air. This distinguished Frenchman wasthe first to adopt a piston in the cylinder of asteam-engine. He invented the digester, which isthe progenitor of a host of lard-tanks and renderingdevices. He was the inventor of the weighted-beamsafety-valve. He was the first, so far as we know,. Pneumatic Trough. PNEUMATIC TUBE. 1756 PNEUMATIC TUBE. to suggest the use of compressed air conveyed bypipes as a means of tiansmitting power. See page 26. After the death of the doctor, the invention tooka sleep for a century, which might be a long sleepfor anything else, but is for an invention only areasonable nap. or seventeen centurieselapsed between the double-cylinder fire-engine ofCtesibus of Alexandria and the similar engine ofNuremberg. The .eolipile of Hero is substiintiallyanalogous to tlie water-wheel of the worthy Dr. Bar-ker, who left us a century back or thereabout, exceptthat the lluid agent of one is sleum and of the otherwater. The principle is the same, and the turbineinvented by Fourneyron, in 1823, does not differ inits pr
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