Construction
The law for the construction of the Stelling van Amsterdam was passed in 1874. During the preparations prior to construction, it became apparent that the design was already outdated by modern technical advances. The invention of the brisance grenade (which would explode on impact of the target) necessitated the change from masonry to concrete forts. But the Dutch did not have the required experience yet using and building with concrete. Therefore extensive tests had to be performed where concrete structures were shelled with the heaviest artillery available at that time. Further delays resulted from the fact that the sand foundations had to settle for several years before the forts could be built on them. Not until 1897 could the actual construction finally begin.
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