An act was accordingly obtained, in the session of 1789, not only for the erection of Pladda Light-house, but for extending the powers of the Commissioners to the erection of such other light-houses on the coast of Scotland as to them should seem necessary, whenever the free produce of the duties of 1½d. and 3d. _per_ ton respectively on British and foreign ships should enable the Board to do so. In consequence of the act of 1788, authorising the collection of half duties so soon as two of the four light-houses mentioned in the original act should be lighted, collectors at the different customhouses of all the ports of Great Britain were appointed to receive the Northern Light-house duty, and for their trouble they were to be paid at the rate of 10 _per cent._ upon the sums they should respectively receive: But the business being scarcely organized in 1789, and only half duties being exigible, the whole money collected in that year amounted but to L. 290:14:6, and even this small sum formed part of two years’ collection. From the smallness of the duties, and the extent of the operations which the Commissioners had now on hand, they were much pressed for the necessary funds, and but for the liberality of their bankers Sir William Forbes and Company, the operations of the Board must have been greatly hampered. Indeed, Sir James Hunter Blair, one of the partners of that house, when Lord Provost of Edinburgh, and _ex officio_ a member of the Board, had been highly instrumental in forwarding the establishment of the Northern Light-houses; and it was, perhaps, from such adventitious circumstances, together with the economy of the measures originally pursued, that the progress of the Light-house works proceeded, without experiencing any interruption from want of funds. [Sidenote: ~1790.~] The light-house of Pladda was finished in the course of the year 1790, and lighted on the 1st day of October. As before noticed, it is situated in the Firth of Clyde, on the small island of Pladda, near the south-west point of the island of Arran, in North Lat. 55° 30´ and Long. 5° 4´ west of London; the entrance of Campbeltown Loch bearing, by compass, W.NW. ¼ N., distant 18 miles; Island of Sana W., distant 20 miles; Craig of Ailsa SW. by S., distant 15 miles; entrance to Loch Ryan S.SW., distant 25 miles; and the Heads of Ayr E.SE., distant 16 miles. The light-room is elevated above the medium level of the sea 70 feet; and the light is seen from NE. by E. to NW. by W. and intermediate points of the compass south of these points. [Sidenote: ~1791.~] [Sidenote: Distinguishing light at Pladda.]