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Model of a Floating Beacon
Rijkswerf Rotterdam (possibly), 1845, demonstration model, NG-MC-839-2
Rotary Pump
anonymous, c. 1850 - c. 1858, test model, NG-MC-650
Tangent Sight
anonymous, c. 1845 - c. 1858, demonstration model, NG-MC-703
Support of a Tangent Sight
anonymous, c. 1860 - c. 1870, demonstration model, NG-MC-1374
Tangent Sight
anonymous, 1845 - 1865, demonstration model, NG-MC-1889-30