CRYSTALLINE a.
ine sky." Milton. Crystalline heavens, or Crystalline spheres, in the Ptolemaic system of astronomy, two transparent spheres imagined to exist between the region of the fixed stars and the primum mobile (or outer circle of the heavens, which by its motion was supposed to carry round all those within it), in order to ex…
INDUCTIVE a.
- Inductive sciences, those sciences which admit of, and employ, the inductive method, as astronomy, botany, chemistry, etc.
QUADRANT n.
for measuring altitudes, variously constructed and mounted for different specific uses in astronomy, surveying, gunnery, etc., consisting commonly of a graduated arc of 90º, with an index or vernier, and either plain or telescopic sights, and usually having a plumb line or spirit level for fixing the vertical or horizo…