Two "drums" were placed betwixt the cylinders to ensure accuracy in the register,--over and under which the sheet was conveyed in it s progress from one cylinder to the other,--the sheet being at all times firmly held between two tapes, which bound it to the cylinders and drums.

This is commonly called, in the trade, a "perfecting machine;" that is, it printed the paper on both sides simultaneously, and is still much used for "book-work," whilst single cylinder machines are often used for provincial newspapers.
After this, Mr.Cowper designed the four cylinder machine for The Times,--by means of which from 4000 to 5000 sheets could be printed from one forme in the hour.

In 1823, Mr.Applegath invented an improvement in the inking apparatus, by placing the distributing rollers at an angle across the distributing table, instead of forcing them endways by other means.
Mr.Walter continued to devote the same unremitting attention to his business as before.

He looked into all the details, was familiar with every department, and, on an emergency, was willing to lend a hand in any work requiring more than ordinary despatch.
Thus, it is related of him that, in the spring of 1833, shortly after his return to Parliament as Member for Berkshire, he was at The Times office one day, when an express arrived from Paris, bringing the speech of the King of the French on the opening of the Chambers.

The express arrived at 10 A.M., after the day's impression of the paper had been published, and the editors and compositors had left the office.