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- Sprengel_pump abstract "The Sprengel pump is a vacuum pump invented by Hanover-born chemist Hermann Sprengel in 1865 while he was working in London. The pump created the highest vacuum achievable at that time.The system used drops of mercury falling through a small-bore capillary tube to trap air from the system to be evacuated. The falling mercury drops compressed the air to atmospheric pressure which was released when the stream reached a container at the bottom of the tube. As the pressure dropped, the cushioning effect of trapped air between the droplets diminished, so a hammering or knocking sound could be heard, accompanied by flashes of light within the evacuated vessel. The speed, simplicity and efficiency of the Sprengel pump made it a popular device with experimenters. Sprengel's earliest model could evacuate a half litre vessel in 20 minutes. The device was later found capable of reducing the pressure to less than 1 mPa.William Crookes used the pumps in series in his studies of electric discharges. William Ramsay used them to isolate the noble gases, and Joseph Swan and Thomas Edison used them to evacuate their new carbon filament lamps. The Sprengel pump was the key tool which made it possible in 1879 to sufficiently exhaust the air from a light bulb so a carbon filament incandescent electric light bulb lasted long enough to be commercially practical. Sprengel himself moved on to investigating explosives and was eventually elected as a Fellow of the Royal Society.".
- Sprengel_pump thumbnail NSRW_Air_Pump2.png?width=300.
- Sprengel_pump wikiPageExternalLink v=onepage&q&f=false.
- Sprengel_pump wikiPageID "19760932".
- Sprengel_pump wikiPageRevisionID "545762528".
- Sprengel_pump hasPhotoCollection Sprengel_pump.
- Sprengel_pump subject Category:Vacuum_pumps.
- Sprengel_pump type AirPump102692513.
- Sprengel_pump type Artifact100021939.
- Sprengel_pump type Device103183080.
- Sprengel_pump type Instrumentality103575240.
- Sprengel_pump type MechanicalDevice103736970.
- Sprengel_pump type Mechanism103738472.
- Sprengel_pump type Object100002684.
- Sprengel_pump type PhysicalEntity100001930.
- Sprengel_pump type Pump104021798.
- Sprengel_pump type VacuumPumps.
- Sprengel_pump type Whole100003553.
- Sprengel_pump comment "The Sprengel pump is a vacuum pump invented by Hanover-born chemist Hermann Sprengel in 1865 while he was working in London. The pump created the highest vacuum achievable at that time.The system used drops of mercury falling through a small-bore capillary tube to trap air from the system to be evacuated. The falling mercury drops compressed the air to atmospheric pressure which was released when the stream reached a container at the bottom of the tube.".
- Sprengel_pump label "Sprengel pump".
- Sprengel_pump sameAs m.04q7fzg.
- Sprengel_pump sameAs Q17082947.
- Sprengel_pump sameAs Q17082947.
- Sprengel_pump sameAs Sprengel_pump.
- Sprengel_pump wasDerivedFrom Sprengel_pump?oldid=545762528.
- Sprengel_pump depiction NSRW_Air_Pump2.png.
- Sprengel_pump isPrimaryTopicOf Sprengel_pump.
