What is a roll formerly used in the English exchequer, otherwise called the Great Roll, on which were taken down the accounts of debts to the king; -- so called because put together like a pipe. Mozley & W called?

pipe — A roll formerly used in the English exchequer, otherwise called the Great Roll, on which were taken down the accounts of debts to the king; -- so called because put together like a pipe. Mozley & W. (Webster's 1913.)