Fig. 141. Celestial Globe Gores by Johannes Oterschaden, ca. 1675.
Fig. 142. Engraved Sections for Globe Horizon Circle by Johannes Oterschaden, ca. 1675.
In the eighteenth century the instrument maker, George Graham (1675-1751), constructed a complicated planetarium, in honor of Charles Boyle, Earl of Orrery (1676-1731), which he called an orrery. His machines, varying much in the character of construction, were especially popular in the eighteenth century. The nineteenth century saw them frequently in use for purposes of instruction and the regret may well be expressed that for serious purposes they seem to have lost favor.
