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In 1896 the Middle Lock in IJmuiden had been opened. This was the largest lock in the world and at the time, it was called {{lang|nl|Groote Sluis}}. It was 225 m long, 25 m wide and 10 m deep. On the canal itself, ships of 175 m by 17.75 m by 8.00 m were allowed.{{sfn|KvK Amsterdam|1899|p=70}} ADM’s largest dry dock, [[Wilhelmina Drydock (1899)|Wilhelmina Drydock]], was 129 m long, had an inside width of 22 m, and a depth on the blocks of 6.10 m.

In 1896 the Middle Lock in IJmuiden had been opened. This was the largest lock in the world and at the time, it was called {{lang|nl|Groote Sluis}}. It was 225 m long, 25 m wide and 10 m deep. On the canal itself, ships of 175 m by 17.75 m by 8.00 m were allowed.{{sfn|KvK Amsterdam|1899|p=70}} ADM’s largest dry dock, [[Wilhelmina Drydock (1899)|Wilhelmina Drydock]], was 129 m long, had an inside width of 22 m, and a depth on the blocks of 6.10 m.

In these circumstances, it was logical that ADM began to think of a larger dry dock. Already in 1908, ADM negotiated with the Amsterdam municipality about concentrating its activities near the location of Wilhelminadok. As soon as that dock of about 10,000t would be completed, Koninginnedok would be moved into a new harbor and Wilhelminadok would take her place.{{sfn|Haagsche courant 10 June|1908}}

In these circumstances, it was logical that ADM began to think of a larger dry dock. Already in 1908, ADM negotiated with the Amsterdam municipality about concentrating its activities near the location of Wilhelminadok. As soon as that dock of about 10,000t would be completed, Koninginnedok would be moved into a new harbor and Wilhelminadok would take her place.{{sfn|Haagsche courant 10 June|1908}}

== Ordering and construction ==

== Ordering and construction ==


Latest revision as of 15:52, 18 December 2025

Former floating dry dock in Amsterdam, Netherlands

Juliana Drydock is towed to her first mooring place next to Wilhelmina Drydock on 12 May 1911.

Name Juliana Drydock
Builder Nederlandsche Scheepsbouw Maatschappij (NSM)
Homeport Amsterdam
Length
  • 0 ft 0 in (0.00 m) (1899)
  • 0 m (0 ft) (1959)
Beam
  • 0 ft 0 in (0.00 m) (pontoons)
  • 0 ft 0 in (0.00 m) (inside top)
  • 0 ft 0 in (0.00 m) (inside bottom)
  • 0 ft 0 in (0.00 m) (1959)
Draft
  • 0 ft 0 in (0.00 m) (on blocks, 1899)
  • 0 ft 0 in (0.00 m) (ditto, 1959)
Depth of hold
  • 0 ft 0 in (0.00 m) (center)
  • 0 ft 0 in (0.00 m) (pontoon side)

Juliana Drydock of ADM, in Dutch Julianadok was the fourth steel floating dry dock in Amsterdam. It was built

1917 map showing Juliana Drydock in its first position

By 1900, the Amsterdamsche Droogdok Maatschappij (ADM) had three floating dry docks in operation. The size of the ships that could reach these dry docks was determined by the dimensions of the North Sea Canal and the locks at IJmuiden.

In 1896 the Middle Lock in IJmuiden had been opened. This was the largest lock in the world and at the time, it was called Groote Sluis. It was 225 m long, 25 m wide and 10 m deep. On the canal itself, ships of 175 m by 17.75 m by 8.00 m were allowed. ADM’s largest dry dock, Wilhelmina Drydock, was 129 m long, had an inside width of 22 m, and a depth on the blocks of 6.10 m.

In these circumstances, it was logical that ADM began to think of a larger dry dock. Already in 1908, ADM negotiated with the Amsterdam municipality about concentrating its activities near the location of Wilhelminadok. As soon as that dock of about 10,000t would be completed, Koninginnedok would be moved into a new harbor and Wilhelminadok would take her place. The new 10,000t dry dock would then be moored alongside Wilhelminadok. The 1917 map shows this situation.

Ordering and construction

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