|Method||Steel engraved with original hand colour|
|Artist||Johnston, William and Johnston, Alexander Keith|
|Published||W. & A.K. Johnston, Edinr. William Blackwood & Sons. Edinburgh, & London. [c.1850]|
|Dimensions||210 x 268 mm|
A detailed mid-nineteenth century map, showing the geological structure of the globe, published by William Blackwood for W. & A.K. Johnston's Physical Atlas of Natural Phenomena. The map is colour coded in original wash colour, corresponding to the formations and stratifications outlined by the geologist Ami Boué, a French German natural historian who contributed, among others, a number of important papers on the geology of Scotland and the Balkan States, as well as being a founding member, and later President, of the Société Géologique de France. Along the bottom of the plate, a colour coded series of illustrations shows the principal mountains of the globe, with their elevations above sea level and their geographical longitude.
W. & A.K. Johnston was one of the major publishing houses of the 19th century. Founded by William and Alexander Keith (1804-1871) Johnston, they apprenticed under the Scottish publisher and globe maker James Kirkwood in Edinburgh. They later went on to establish their own business in the city, expanding their output into not only maps, but atlases, guide books, globes and educational posters. Alexander's son, also called Alexander Keith Johnston (1844-1879), continued the business, as well as authoring various geographical works of his own. The business continued to publish material under the Johnston name until the 1960s.
Condition: Minor time toning to edges of sheet. Minor foxing to margins. Blank on verso. Includes double-sided sheet of accompanying descriptive text.