This large map is a superb example of thematic mapping with a series of maps used to illustrate the distribution of heat throughout the world. The maps show isothermal lines of mean annual temperature, lines of isabnormal mean annual temperature, and isothermals in the months of January and July. The isothermal and isabnormal lines are also shown in north and south polar projections.
Keith Johnson worked in conjunction with German Heinrich Berghaus to produce the Physical Atlas, the first truly comprehensive thematic atlas. The maps from this atlas made a huge impact on cartography in general and specifically on the graphic portrayal of geographical data.
This example has the small stamp of the Wakefield Mechanics Institution. Established during the Industrial Revolution, the Mechanics Institution movement in Britain intended to provide adult education for the working man. At a time when most libraries were available only to subscribers, the Mechanics Institutions frequently became the libraries of the working class. Formed in 1841, the Wakefield Mechanics Institution was dissolved in 1935 and its library dispersed.
References: Phillips (Atlases) #229; Robinson, pp. 64-75.
Clean and bright with light toning along the edges of the sheet. There is a "Wakefield Mechanics Institution " stamp on both recto and verso.