Jacob van Heemskerck

Improved Hertog Hendrik-type.

Jacob van Heemskerck in her original condition (collection J. Klootwijk)

Construction details
Name	Jacob van Heemskerck
Dockyard	Rijkswerf, Amsterdam
Laid down	August 15 1905
Launched	September 22 1906
Commissioned	April 22 1908
Pennants	HW-3 A-881
Status	Commissioned as the stationary battery "Batterijschip IJmuiden" on April 19 1939 and stationed in IJmuiden. Scuttled by own crew May 14 1940 to avoid capture. Wreck was raised on July 16 1940 and towed to Amsterdam on July 24. Towed to Kiel in March 1941 and rebuilt at the Howaldtswerke to the floating anti-aircraft battery "Undine. Recovered in Wilhelmshafen. Rebuilt as accommodation ship at the Rijkswerf Amsterdam and commissioned as such on February 23 1948 as Hr. Ms. Neptunus. Decommissioned on September 13 1974 and stricken October 4 1974.

Specifications
	Dutch navy	Kriegsmarine
Displacement	5000 tons	4445 tons
Crew	351
Dimensions	98 x 15,20 x 5,70 m
Armament*	2 x 240 mm No 2  ** 6 x 150 mm 6 x 75 mm 4 x 37 mm	8 x 105 mm 4 x 37 mm 16 x 20 mm
Fire control	Rudimentary	1 Würzberg radar 2 optical range finders
* All armament was removed during her conversion to an accommodation ship

Armour details
Main belt	102-152 mm
Bulkheads	152 mm
Main deck	51 mm
Main turrets	102 mm
Secondary turrets
Barbettes	197 mm
Barbettes	152 mm
Conning tower	194 mm

Propulsion details
Boilers	6 Yarrow
Machinery	2 Triple expansion engines
Performance	6400 hp
Shafts	2
Bunkerage	610 tons coal
Range	3300 miles @ 10 knots
Speed	16,5 knots
Notes	The Undine didn't retain her propulsion system and had to be towed.

Photos
	Postcard of Queen Wilhelmina and her daughter visiting Jacob van Heemskerck, date and place unknown (Collection webmaster)

August 17, 2014

Added new photo.

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