CREATE TABLE table_name_75 (gross_tonnage INTEGER, ship VARCHAR(255), material VARCHAR(255), date_commissioned VARCHAR(255))
Name the sum of gross tonnage for wood on date more tahn 1846 for comissioned and ship of esk
    
SQL: SELECT SUM(gross_tonnage) FROM table_name_75 WHERE material = "wood" AND date_commissioned > 1846 AND ship = "esk"