What is the primary artillery for the  1,051 ships?
CREATE TABLE "wooden_s_steamboat_of_chile_and_peru_at_" (
  "warship" text,
  "tons_l_ton" text,
  "horse_power" real,
  "speed_knots" real,
  "main_artillery" text,
  "built_year" real
);
SELECT "main_artillery" FROM "wooden_s_steamboat_of_chile_and_peru_at_" WHERE "tons_l_ton"='1,051';