Dutch floating battery Zr.Ms. Neptunus tested off Texel according to the Dutch newspaper Nieuwe Courant van Den Helder dated 21 September 1861

Object no. NG-MC-1154. Porthole model made by P.A. Bruijn, at the navy yard at Willemsoord 1861. Museum url http://hdl.handle.net/10934/RM0001.COLLECT.244967

An item dated Den Helder the 20th reported that in the morning before the Dutch steam ship Zr.Ms. Cycloop (1) towed the Dutch floating battery Zr.Ms. Neptunus from the Nieuwediep to the coast line of the Dutch island Texel. A day earlier failed this effort. The Cycloop stayed nearby during the tests done with the battery.

Notes
1. Paddle steamship 2nd class, Netherlands, on stocks at naval yard at Flushing, Netherlands 23 July 1840, launched 13 June 1843, condemned and stricken 1873, dimensions 47,00 x 9,20 x 4,00 metres, 875 tons displacement, 6 guns., 220 hp horsepower.
2. The former ship of the line Koning der Nederlanden converted into a floating battery and renamed Neptunus.