This was based on the full - scale armor trials conducted using the hulk of the old pre-dreadnought battleship Chesma in 1913 .
This was added almost 500 long tons ( 508 t ) of weight to the ship .
This was based on the full - scale armor trials conducted using the hulk of the old pre-dreadnought battleship Chesma in 1913 and added almost 500 long tons ( 508 t ) of weight to the ship .