De Tjongermolen is a smock mill in Mildam, Friesland, Netherlands which was built in 1918, replacing a mill that had blown down and rebuilt on a new site in 1983.

[1] The restoration, which resulted in a smaller mill than the original, was completed on 21 October 1983.

This drives the wallower (22 cogs) at the top of the upright shaft.

The lower crown wheel, which has 32 cogs is carried on the axle of an Archimedes' screw, which was used to drain the polder.

The axle of the screw is 22 centimetres (9 in) diameter and 3.40 metres (11 ft 2 in) long.

Each revolution of the screw lifts 82 litres (18 imp gal) of water.