The improvement on the Mersey itself led to a further scheme for making the Mersey and Irwell navigable from Warrington to Manchester, thus establishing direct water communication between Liverpool and Manchester, as an alternative to transport by road. A survey of the two rivers was carried out in 1712, and a prospectus was issued in which it was said:—
"The inland parts of Lancashire and Yorkshire being favoured with a great variety of valuable manufactures in woollen, linen, cotton, &c., and that in very great quantities, has made that neighbourhood as populous, if not more so, than (London and Middlesex excepted) the same extent of any part of Great Britain. The trades of these counties extend considerably through the whole island, as well as abroad, and the consumption of groceries, Irish wool, dyeing stuffs, and other important goods consequently is very great; but as yet not favoured with the conveniency of water carriage, though Providence, from the port of Liverpool up to the most considerable inland town of Lancashire, Manchester, has afforded the best, not yet employed, rivers of Mersey and Irwell for that purpose."
It was not until the passing of the Mersey and Irwell Navigation Act, in 1720, that the work of rendering these rivers navigable between Warrington and Manchester was begun, and another twenty years elapsed before it was completed. The result of this "conveniency of water carriage" when it was, at last, obtained, was to reduce the cost of transport of goods and merchandise from forty shillings a ton by road to ten shillings a ton by river. The goods traffic between Liverpool and Manchester at this time amounted to about 4000 tons a year; but it had, prior to the provision of water transport, naturally been restricted to the quantity that could be carried by the packhorses, carts and waggons of those days. Hence the river navigation gave the advantage of a transport not only cheaper in price but greater in capacity. It will be seen later on, however, that the Mersey and Irwell navigation subsequently developed disadvantages for which a remedy was sought in the construction of the Duke of Bridgewater's canal.
An Act, passed in 1720, for making the river Weaver navigable from Winsford Bridge, beyond Northwich, to Frodsham Bridge, near the junction of the Weaver with the Mersey (a distance of about twenty miles), was not only of further material advantage to the port of Liverpool but a first step in an important development of the salt mines of Cheshire. These mines have been described as "incomparably the richest of the salt mines and brine pits of England"; but at the date in question their working was greatly hampered by transport costs and difficulties in the matter both of fuel and of the distribution of the salt, when made.
Fuel was required for heating the furnaces and the pans in which the brine was evaporated into salt; and in the earliest days of the industry the salt-makers used for this purpose faggots of wood brought from the forests on the borders of Cheshire and Staffordshire. As long as these supplies were available, the principal seat of the salt trade was at Nantwich, in the higher part of the Weaver, and near to the forests where the wood was obtained. But the forests got depleted in course of time, and the industry then moved to other works lower down the river which could be operated with coal brought from the Lancashire coal-field. This coal, however, had to be carried, by cart or packhorse, a distance of twelve or fourteen miles; and inasmuch as two tons of coal were required for every three tons of fine salt made, the cost of transport of raw materials was a serious item.
As for the manufactured salt, that was distributed in the same way, even such small consignments as could then alone be sent to Liverpool having to be taken thither by road. In the circumstances the salt trade remained comparatively undeveloped in Cheshire while it was making great advance at Newcastle-on-Tyne, where the coal readily obtained, by water, from the neighbouring coal-fields was used in the production of salt from sea-water. In the time of the Stuarts the manufacture of salt was one of the most important of Newcastle's industries and articles of export.
When, under the Act of 1720, the Weaver was made navigable as far as the Northwich and Winsford Bridge salt works, the land journey for Lancashire coal was reduced from twelve or fourteen miles to five or six miles, and the salt could be sent direct to Liverpool by water. The greatest impetus to the Cheshire salt industry (to the consequent detriment, and eventual extinction, of that at Newcastle-on-Tyne, though with a further advantage to the trade of Liverpool) was, however, not given until the makers were enabled to get their coal all the way by water through the supplementing of the now navigable Weaver by the Sankey Canal—of which more hereafter.
In the same year that the Act for improving the navigation of the Weaver was passed, Parliament sanctioned a no less important work on the river Douglas, which passes through Wigan, and has its outlet in the Ribble estuary, at a point about nine miles west of Preston. Wigan is situated on a part of the Lancashire coal-fields which contains some of the richest and most valuable seams of coal to be found in Lancashire; but down to 1720 the only means of distributing this coal was by cart or packhorse. The opening of the Douglas to navigation allowed of the coal being sent by water to the estuary of the Ribble, and thence forwarded up the Ribble to Preston, or, alternatively, along the coast either to Lancaster in the one direction or to Liverpool and Chester in the other. These were tedious routes, and the voyage from the Ribble estuary along the coast was often very dangerous on account both of storms and of sand-banks. The lines of water communication were, nevertheless, so much cheaper than land carriage that they were followed for about fifty years—until a safer and more expeditious waterway was provided through the opening of the Leeds and Liverpool Canal.[[22]] Thomas Baines, from whose "History of the Town and Commerce of Liverpool" I glean these details, adds:—
"With all its defects, the Douglas navigation may be regarded as the primary cause of the manufacturing prosperity of the town of Preston, which it was the first means of supplying with cheap fuel for its workshops and factories. It may, also, be considered as one of the early causes of the commercial prosperity of Liverpool, which has always been much promoted by the possession of cheap and abundant supplies of coal and salt."
The rendering of the Aire and Calder navigable, under an Act of Parliament passed in 1699, was an important event for the then rising manufacturing towns of Leeds, Wakefield, Halifax, Bradford and Huddersfield, situate on or within a convenient distance of one or other of these two rivers which, joining at Castleford, ten miles below Leeds, thence flow in a combined stream to their junction with the Yorkshire Ouse, and so on to the Humber and the ports of Hull and Grimsby. The event in question was no less interesting because it marked a further development in an industrial transition which constitutes a leading factor in the economic history of England.