|Method||Lithograph with original hand colour|
|Published||London: James Reynolds & Sons, 174, Strand [c.1860]|
|Dimensions||195 x 205 mm|
An infographic diagram of the calculation of longitude, featuring a representation of the Earth, Sun, Earth's Moon, the planet Jupiter, and two fixed stellar points. The diagram was printed on card as part of a series of Astronomical Diagrams published by James Reynolds & Sons, following the success of their much larger series Introduction to Natural Philosophy. Two columns of text below the diagram describe the method for ascertaining longitude.
John Emslie (1813-1875) was a British draughtsman, illustrator, and engraver, particularly known for his long standing collaboration with the London-based publisher James Reynolds. Their most notable contribution was a series of 250 illustrations with explanatory text published as the Introduction to Natural Philosophy.
Condition: Minor time toning to edges of sheet. Framed in a black box frame.