Before revision: The cube shape of the teapot would stabilise it so that it wouldn't roll over and scald the person making the drink, whereas conventional curved teapots would roll over when the ship rocked from side to side.
After revision: The cube shape of the teapot would stabilise it so that it would not roll over and scald the person making the drink, whereas conventional curved teapots would roll over when the ship rocked from side to side.