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What's new: Thu Mar 20 (2003) Message from Senegal
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Message from Senegal
A message from Keur Mousse in Senegal reached me about a slow-down in the digging of the well. This because of a very hard layer of laterite just above the water bearing layer at 35 meters depth. Demotech in the Netherlands has now some more time to provide a proper design and a scale model for a well cover. Such a scale model, together with pictures and instructions by telephone should help to communicate the ideas of Ives and me to our friends in Senegal about the well cover.
In our garden Rejo and I made a mockup of the well looking like the well in Ives project garden in Keur Mousse (see picture). Build with adhesive tape from plastic sheet and bamboo sticks, it will give us the impression of size and energometrics for the proper functioning.
This is what we want to achieve:
A well cover, first to be made from wooden boards as a prototype. But for the final product metal profiles and sheet is preferred.
The person hoisting waters should stand on it in the middle, a container of some 200 liters will be positioned close to the edge. The construction of the well cover has to take this load without the slightest risk.
A frame is constructed on top of the well cover to attach the pulley. The person lifting the water from the well does this by pulling down the rope running over the pulley. The frame has to position the pulley high enough over the person to allow an upward movement of the arm to grip for the rope.
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Rombout has made a frame for the pulley wheel (see picture Rombout spinning the wheel). It puzzles people that the metal pins sticking out of the pulley hub (the actual axle) run in a rough winding of plastic rope with so little friction. They expect the axle has to run in a metal support. It takes some explaining, that friction of steel on steel causes the rapid wear of the normal pulley construction. Apart from giving long service and low friction, the "rope bearing" is also very easy to make and to repair.
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What's new: Message from Senegal
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