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Brass Faucet Water Aspirator for Fast Vacuum Filtering (Boy Mechanic, 1915)
A water-jet vacuum pump that screws onto a tap: water rushing down a 3/4 in brass tube past a deflector plate sucks air through a 1/4 in side tube, pulling a vacuum in a corked bottle so liquids filter through the funnel far faster.
Intermediate
Two hours
Instructions
1
1
Read the Boy Mechanic
Read the Boy Mechanic
"Turn on the faucet, and it will be found that the time required to filter any liquid will be greatly reduced."
2
2
Cut the tubes
Cut the tubes
Cut brass tube 7 in long and 3/4 in outside, and another 3 in long and 1/4 in outside. Drill a hole in the side of the large tube about 3 in from one end so the small tube fits it very tightly.
Materials for this step:
Brass Tube1 pieceTools needed:
Hacksaw
Hand Drill3
3
Fit the deflector
Fit the deflector
Saw a slot diagonally across the large tube from one side to the centre (A) and fit a piece of sheet brass tightly in it, placed so the small tube empties directly against it. Solder the plate and the small tube in.
Materials for this step:
Brass Sheet1 piece
Tin-Lead Solder1 pieceTools needed:
Hacksaw
Soldering Iron4
4
Fit to the tap
Fit to the tap
Thread the upper end of the large tube inside to screw onto the faucet, or solder on a garden-hose style coupling.
Materials for this step:
Tin-Lead Solder1 pieceTools needed:
Tap and Die SetSoldering Iron5
5
Set up the filter
Set up the filter
Seal a glass tube and the filter funnel into the cork of a large bottle with melted paraffin. Join the small brass tube to the glass tube with rubber hose. Fold the filter paper so it sticks tight to the funnel.
Materials for this step:
Glass Bottles with Stoppers1 piece
Corks1 piece
Glass Tube1 piece
Glass Funnel - Stemmed1 piece
Paraffin Wax1 piece
Rubber Hose1 piece
Filter Paper1 piece6
6
Use
Use
Turn on the tap moderately: too much water makes the suction strong enough to puncture the filter paper.
7
7
Troubleshooting
Troubleshooting
Aspirator troubleshooting.
Flow
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8
8
History and honest limits
History and honest limits
From **The Boy Mechanic, Book 2** (Popular Mechanics, 1915), pp. 146-147 (checked on the archive.org scan boymechanicbook200chic2). The trap-bottle and implosion notes are ours.
Materials
10- 1 piecePlaceholder
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