Heiroglyphs of Egyptians retrieving grain using an open stairwell.
This was a great improvement on the tunnels of the first grain silo that were poorly ventilated and resulted in workers suffocating.
The second generation of grain silos were much more accessible with an open stairway and a ventilation shaft connecting to the tunnels. Wind could blow into the tunnels via the stairwell and come out a ventilation shaft allowing better circulation of air so that the workers did not suffocate.
A grain silo in the Step Pyramid complex. Access to the bottom of the silo is from the steps in the pit next to it.
An open stairwell leading to tunnels used for retrieving grain from the 11 silos that were connected it.
Entrance to the tunnels at the bottom of the stairwell.
An open stairwell that would allow better ventilation of the tunnels leading to the grain silos.
An open stairwell for retrieving grain from the silos.
An open stair well used to retrieve grain from the second generation silos of the Djoser Complex.
A ventilation shaft connected to the grain silo tunnels. Grain could also have been pulled up in baskets.
A second generation grain silo in the Djoser complex.
A grain silo / ventilation tube in the Djoser complex.
Retrieving grain was much easier with an open stairwell.
A crane for lifting out baskets of grain and lowering items into the tunnels.
Stairwell down to the tunnel for retrieving grain from the silos The shape of the stairwell would have directed wind into the tunnels.
The new generation of grain silos had an open stairwell providing better ventilation of the underground tunnels.