and turned out of the
solid, of three cubits in diameter.

Near this observatory was a large clock, with one wheel two cubits
in diameter, and two smaller ones, which, like it, indicated hours,
minutes, and seconds.

_In the south and lesser Observatory._

8. An armillary sphere of brass, with a steel meridian, whose
diameter was about 4 cubits.

_In the north Observatory._

9. Brass parallactic rules, which revolved in azimuth above a brass
horizon, twelve feet in diameter.

10. A half sextant, of four cubits radius.

11. A steel sextant.

12. Another half sextant, with steel limb, four cubits radius.

13. The parallactic rules of Copernicus.

14. Equatorial armillaries.

15. A quadrant of a solid plate of brass, five cubits in radius,
shewing every ten seconds.

16. In the museum was the large globe made at Augsburg, see p. 134.

_In the Stiern-berg Observatory._

17. In the central part, a large semicircle, with a brass limb, and
three clocks, shewing hours, minutes, and seconds.

18. Equatorial armillaries of seven cubits, with semi-armillaries
of nine cubits.

19. A sextant of four cubits radius.

20. A geometrical square of iron, with an intercepted quadrant of
five cubits, and divided into fifteen seconds.

21. A quadrant of four cubits radius, shewing ten seconds, with an
azimuth circle.

22. Zodiacal armillaries of brass, with steel meridians, three
cubits in diameter.

23. A sextant of brass, kept together by screws, and capable of
being taken to pieces for travelling with. Its radius was four
cubits.

24. A moveable armillary sphere, three cubits in diameter.

25. A quadrant of solid brass, one cubit radius, and divided into
minutes by Nonian circles.

26. An astronomical radius of solid brass, three cubits long.

27. An astronomical ring of brass, a cubit in diameter.

28. A small brass astrolabe.

In almost all the instruments now enumerated, the limb was subdivided by
diagonal lines, a method which Tycho first brought into use, but which,
in modern times, has been superseded by the inventions of Nonius and
Vernier.

When Tycho had thus furnished his observatory, he devoted himself to the
examination of the stars; and during the twenty-one years which he spent
in this delightful occupa