Plate III.
Pl. III.
This Plate is reduced from a manuscript-map in the possession of the writer, which is drawn upon a large scale, originally intended for exhibiting the depths of the German Ocean or North Sea, and the situations of the numerous Light-houses on the coasts of the United Kingdom, and opposite Continent, but is here given with the view of shewing the relative position of the Bell Rock.
The chief peculiarity of this map is the sectional lines, exhibiting at one view the relative depths of the ocean, in connection with a theory which the writer has advanced, regarding the wasting of the firm ground by the effects of the sea, as alluded to in Appendix [V.] These sectional lines, of a deeper shade, are drawn across the German Ocean, from shore to shore. As, for example, between Shetland and Norway, the greatest depth is ascertained to be about 140 fathoms, and so of other examples, extending southward as far as the Straits of Dover. The soundings are all marked in fathoms, and, in so far as regards the east coast of Scotland, have been very generally made from on board of the vessels belonging to the service of the Northern Lights. The forms given to the principal sand-banks, and the soundings in the central and eastern parts of this great basin, have been taken from the best maritime surveys, and nautical authorities. The numerous Light-houses on the respective coasts are coloured; those of Scotland being blue, England red, Ireland green, and the foreign Lights yellow.
Plate IV. CHART, SHEWING THE PARTICULAR POSITION OF THE BELL ROCK.
CHART
Shewing the Position
of the
BELL ROCK LIGHTHOUSE
relatively to the Coasts of
FIFE and FORFAR SHIRES.
Drawn by A. Stevenson
Engd. by W. H. Lizars
PLATE IV.