List of design criteria for the rubber bag

In relation to use with the tripod pulley system

Rubber bag

List of desing criteria for the rubber bag

• in relation to use with the tripod pulley system
• in relation to use for fetching water without the use of a pulley

In relation to use with the tripod pulley system
*Fill fast when dropped into the water (<3 sec.)

• Diameter rubber bag bigger then metal ring to which it is connected. This because the ring should not get the chance to hook on to the rough surface of the well lining. It is less of a problem when the rubber bag itself bounces against the wall when when hauling up or letting go down.
• Easy to empty when bag is hauled up. It has to be overturned. For this the rubber bag should end in a point, that is easy to get a firm grip on, also when wet.