Tom blok
The hoist device, the delu
Gul streg
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The hoist in the south of Tunisia
If you look at [32] you will understand that the two uppermost ropes lift the two sacks. The lower cords control the long nozzle so the water gushes out.
[28]
 Here we have the hoist in close-up
The big pulley is built up of about twenty wooden "wedges". The axle is placed in two forked sticks, which work as bearings. Then it is easy to remove the pulley and take it home.
[29]
 The hoist and a disused modern pump
The pulley is made from a wheel taken from a wheelbarrow.
[30]

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Hoist and well in Tunisia
Note the uppermost ropes and the cords at the bottom. We can see two of the four draught animals. Every pair has a bag. The picture gives us the moment at the end of the sequence. Now, if the pull-stroke were less than four metres the animals would be forced to walk backwards, but here the animals are disengaged from the harness and turned around. Then they walk up the ramp.
[31]
 The mainlines of the hoist
My drawing is incomplete as the man who guides the donkey is missing. At the end of the stroke, the man lifts the trace so the animal can turn around and then walk up the ramp. At the top, the donkey again turns around and then takes a little rest. After a minute, the man and the donkey assist each other to overcome the extra haul at the beginning. After a few steps the donkey takes over the entire work.
[32]