What was launched and laid down in February 1819?
CREATE TABLE "1818_1821_orders" (
  "name" text,
  "built_by_hm_dockyard" text,
  "ordered" text,
  "laid_down" text,
  "launched" text
);
SELECT "launched" FROM "1818_1821_orders" WHERE "laid_down"='february 1819';