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Camp Water Bag: Canvas Sack With a Porcelain-Insulator Mouthpiece That Cools by Seepage (Boy Mechanic, 1919)
Earl Zander's camp water bag from The Boy Mechanic, Book 3 (1919): a strip of heavy canvas about 2 by 1 ft sewn into a 1 ft square sack, with a porcelain knob insulator sewn into a corner as the mouthpiece and two metal rings for a strap. Hung in the shade in a breeze, water seeping through the cloth evaporates and keeps the rest cool.
Beginner
About 2 hours
Instructions
1
1
Size and cooling
Size and cooling
Loading Jupyter Notebook...
2
2
Read The Boy Mechanic, Book 3
Read The Boy Mechanic, Book 3
"While out on a camping trip I devised a way to supply the camp with cool water."
3
3
Cut and sew the sack
Cut and sew the sack
Cut a strip of heavy canvas about 2 ft long and 1 ft wide. Fold it and sew up the edges to make a sack 1 ft square, making the side and top seams as tight as possible.
Materials for this step:
Canvas Fabric1 piece
Sewing Thread1 pieceTools needed:
Scissors
Tape Measure
Sewing Needle
Sailor's Palm4
4
Sew in the mouthpiece and rings
Sew in the mouthpiece and rings
Sew a large porcelain knob insulator into one upper corner as the mouthpiece; the groove around it makes a water-tight joint with the cloth. Sew two metal rings into the cloth at the top and attach a strap to carry it.
Materials for this step:
Ceramic Insulator1 piece
Metal Ring2 pieces
Leather Strap1 pieceSewing Thread1 pieceTools needed:
Sewing NeedleSailor's PalmScissors5
5
Use it
Use it
Fill the sack with water as cool as you can get, cork the insulator tightly, and hang it in the shade where a breeze will strike it. Water seeps slowly through the cloth and its evaporation keeps the contents cool. It also serves when fishing or on the road.
Materials for this step:
Corks1 piece6
6
Troubleshooting
Troubleshooting
Water bag troubleshooting.
Flow
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7
7
History and honest limits
History and honest limits
From "A Camp Water Bag" by Earl Zander, in **The Boy Mechanic, Book 3**, Popular Mechanics, 1919 (Project Gutenberg 71856; checked on the archive.org scan boymechanic0003unse, p. 122). He does not name the thread or the strap material (leather is ours). The tools, metric figures and the evaporation numbers are ours.
Materials
6- 1 piecePlaceholder
- 2 piecesPlaceholder
- 1 piecePlaceholder
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