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Prince's castle in scaffolding From ruins to construction site The Prince's castle has a long and eventful history. After the retreat of the German occupiers in 1944, who burned down the castle, it fell into disrepair. Today it is a ruin, only the keep or residential tower is still standing and you can visit it as part of the MOT. The Municipality of Grimbergen is the owner and has been carrying out urgent conservation works since 2024 to prevent further decay, but a complete reconstruction of the castle is not possible for various reasons.  And yet the MOT is going to make an attempt! As a museum, we want to turn the Prinsenkasteel into a historic construction site, where we can experiment with and learn from historical construction techniques and tools. Where possible, we rebuild parts of the castle with late medieval techniques, tools and materials. A long-term work, from which we will learn a lot.  The ruin is currently unsafe, we have to wait until after the conservation works (2024-2025)...

Squaring the trunk Although not strictly necessary, it is recommended to debark the tree butt and remove the sapwood, the outer wood with the latest growth. Despite watering, these outer layers between the heartwood and bark can contain nutrients, making the pump susceptible to weathering, fungi and wood-boring insects. Removing this outer layer is done by squaring the trunk. This can be done both before and after the boring process. A practical benefit of squaring beforehand is that you take excess weight off the trunk which makes it lighter to handle. The trunk is fixed with heavy iron clamps low above ground level. After removing the bark with the barking shovel, we opted in this experiment to square the trunk in an octagonal shape using broad axes. You can use a carpenter's adze, but this works a lot slower. The octogonal shape works best for removing the sapwood and fixing the trunk on the boring trestle and in the well. After squaring, the diameter of our pump body was reduced to...

Saw stand With the frame saw and the crane saw you can saw logs into planks. To be able to work with two people on these large saws, the log to be sawn must be placed at a height, on a saw stand.

Balance crane We built this wooden balance crane to allow school pupils to experience the operation of a lever during the Atelier Levers.  Such a crane is a hoist that consists of a vertical pole that is fixed and forms the support point for the horizontal beam that serves as a lever. Sometimes the lever hangs from a chain, allowing it to be turned and swiveled.  The load is connected to the lever by means of a rope, chain or something similar. Balance cranes were to be found in ports to load and unload ships, on construction sites, in quarries...

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Placing the pump Water was a necessity in every yard and house, in land cultivation and craftsmen's workshops... Before constructing a new house, a well had to be dug to supply water for making the mortar, certainly in remote places. The location of a pump was well thought about, usually not far from the kitchen. Sometimes a pump was installed in or at the side of a building in the form of a small pump house or lean-to. Water pumps only protrude low above the ground (approx. 60-100 cm). There are strong regional differences in wells and pumps. We made a model as shown in the drawing on the right. In areas with shallow water, such as the Meetjesland, short pumps with a fixed handle transverse to the pump rod were found. Elsewhere, a long, pivoting hand crank was used.

All kinds of identifying marks: symbols, letters or numbers, can often be found on tools. These marks may refer to the manufacturers (e.g. Paul Dubois’s La guêpe (wasp)), or to the place where the piece was made (e.g. Gembloux). They emphasize the quality (e.g. acier garanti (guaranteed steel)) or a property (e.g. inoxydable (stainless)); warn that there is a patent pending or in existence; record the name of the object; even give an indication of how to use it, etcetera. In addition there may also be marks of ownership or embellishment.

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Sheer legs The sheer legs that you can see next to the barn of the Tommenmolen is a full-scale reconstruction that we made based on a copy from the MOT collection and from images.  What are they? Sheer legs are a two-legged hoist with which you can lift heavy loads and also move them to a limited extent. The device can be mounted and moved. For example, it has been used since ancient times on construction sites to bring up heavy stones. Until the early 20th century, such a device was used in shipping and the military. Sheer legs consists of two connected legs with a pulley at the top. A rope runs over the pulley to a windlass at the bottom, which has two long spokes that act as a lever. By turning, you can lift a load of several hundred kilos alone or with two without exceptional effort. The device is kept in balance by tethered ropes. This reconstruction nicely illustrates the principles of drive and transmission, which is the subject of the MOT & GO exhibition you can visit in the mill....