"Mr. Mungo Murray's Armillary Trigonometer", Anon.
Period: 1755 (dated)
Publication: Gentleman's Magazine,
Color: Hand Color
4.5 x 7.4 inches
11.4 x 18.8 cm
This interesting engraving shows this ingenious device consisting of five semicircles; viz, meridian, vertical circle, horizon, hour circle, and equator. It was used for resolving many problems in astronomy and spherical trigonometry.
Small abrasion on verso.