The Act of 1711,[43] which remained for over fifty years the principal Act relating to the Post Office, was to be an instrument of taxation. For some fifty years the Post Office had been yielding a revenue, constant and increasing, but nevertheless more or less fortuitous. Its functions had always been defined as primarily to provide for the transmission of letters, for the benefit of commerce, and for the safety and security of the kingdom, by bringing all letters into "one Post Office settled and established in this Kingdom," and conducted immediately under the eye of the King's Government. The amount paid for the farm had increased with the passing of the years, in measure with the increase of the business of the Office--not by any change in the scale of charges, which remained as fixed in 1660. Now, however, the Office was made a financial instrument, the proceeds of which were to be regulated by manipulation of the rates of charge. The results of the Act of 1711 did not fulfil the anticipations of its framers. Provision had been made for the disposal of that increase of revenue which was looked for: "the full, clear, and entire Weekly Sum of Seven Hundred Pounds of Lawful Money of _Great Britain_" was to be paid out of the revenues of the Post Office "towards the Establishment of a good, sure, and lasting Fund, in order to raise a present Supply of Money for carrying on the War and other her Majesty's most necessary Occasions."[44] This £700 was to be paid entirely from the proceeds of the increase in the rates. The existing revenue of £111,461 a year was to be disposed of as theretofore. All pensions and charges on the revenue were to continue, and were to have preference over the payment of £700 a week. Of the surplus over and above the £111,461 a year and the £700 a week, one-third part was to be at the disposal of Parliament, the rest to be paid into the Exchequer with the £111,461.