Four tests for judging the 1889 naval program

The assessment uses four measures: ships produced, cost effectiveness, diplomatic effect, and long-term shipbuilding capacity. The act and the merchant-building boom are linked to roughly twenty-five years of industrial growth before the First World War. That continuity helps explain why Britain entered the war with many yards able to contribute, without the kind of shipbuilding mobilization later associated with the United States and Canada in the Second World War. Before 1914, the Admiralty also kept yards busy by replacing older ships and selling them abroad. Interwar recession, treaty limits, and reduced replacement demand then weakened that industrial base. The missed opportunity to make greater use of the treaty sloop clause shows why capacity must be maintained between emergencies rather than assumed to reappear when war begins.