- Engine room plans, stamped 'Compagnie internationale d'electricité, Liege', and number 1760i, 1898, scale 1 in 5, 1 in 20;
- Installation of electrical cabinets and (main) switchboards in the engine room, stamped 'De Dion, Bouton & Cie, services électriques' and Groeneveld v/d Poll & Co Amsterdam, quoting commission number 3698 from Cuypers & Co, agreed by C.A. Huijgen, 1902, 1906, scale 1 to 1, 1 to 5 and 1 to 10;
- Plans of the engine room, stamped by Groeneveld v/d Poll & Co Amsterdam, number 5704 and on the reverse 'not executed', and one signed by J.Th.J. Cuypers, 1906, 1911, scale 1 to 20 and 1 to 50;
- Drawing of a motor-generator for charging accumulators with a table indicating voltage and revolutions, stamped by Groeneveld v/d Poll & Co Amsterdam, number 5379, 1908.
- Floor plan of the extension of the north wing of the châtelet for the purpose of a machine building, 1911, scale 1 to 100.