 In those days the Woolloongabba still used an old heavy roller drawn by a horse called Dobbin.As it had to be unhitched and led round after each pull of the roller over the pitch, most of the seven minutes was wasted and Brown did not get much of the rolling he asked for.This was of great importance as if he had insisted on seven minutes actual "rolling" instead of messing about at either end the wicket would have been much less dangerous and England would have had less time to bat out before stumps.