As the result of a variety of circumstances, the establishment of regular posts became a necessity in the time of the Great Elector. The extension of the Brandenburg territory, and the political developments, rendered it desirable to adopt all possible means for binding together the entire territory. Regular posts would also contribute to the national welfare and assist industry and commerce, although there was little prospect that at the outset they would prove profitable.[224] In 1646 a riding post between Königsberg and Danzig was established; shortly afterwards a post between Berlin and Königsberg, and thereafter others. In 1649 the control of all the posts was definitely assumed by the Electoral administration.[225] In general the posts went twice weekly; stages were erected for the exchange of horses and postilions. At first, postilions were changed every twelve (German) miles,[226] and horses every four (German) miles. Later, the stages for the changing of horses were reduced to three miles. The usual speed of the posts, travelling day and night, was one mile an hour, and punctuality was insisted on.[227] The journey from Berlin to Königsberg occupied four days, and that from Königsberg to Cleve ten days.[228] There was at first no delivery service, and all letters must be obtained at the post office, where the people were consequently in the habit of congregating to await the arrival of the post.[229] The postage was retained by the Postmaster as the remuneration for his services. For the actual management and conduct of the service he drew on the State funds to the extent of some 6,000 thalers annually, and all official despatches were consequently conveyed free. This charge diminished, however, with the years, and in course of time the service came to yield a profit to the State. In the Postmaster's patent granted in 1661 it was provided that a portion of the proceeds of postage should be accounted for to the State treasury.[230] The rates of postage were at first fixed according to ancient custom, but they were on several occasions reduced. The postage on a letter not exceeding half an ounce in weight sent from Berlin to Wutzkow, from Breslau to Wutzkow, or from Berlin to Frankfort, was 2 groschen, and from Berlin to Magdeburg, 1-1/2 groschen.[231] With the growth of commerce and the establishment of the travelling post and parcel post, the service became more and more successful financially. In 1695 the expenses represented some 50 per cent. of the gross revenue. By 1712 they had fallen to some 41 per cent. The gross revenue was at the same time rapidly increasing. The net revenue, which was, of course, increasing still more rapidly, was in 1695 about 62,000 thalers, and by 1712 had risen to some 137,000 thalers.