| View Cart ⇗ | Info

An instrument which could more readily adapt itself to the swaying of the observer’s body in a sea-way, soon displaced in good measure the astrolabe on shipboard. It in several ways modified forms for a long time served mariners as a convenient help in ascertaining the altitude of the celestial bodies. Precisely when it was first introduced is not certain; but the earliest description of it which has been found is that of Werner in 1514.




Narrative and Critical History of American (New York: Houghton, Mifflin, and Company, 1886)II:99


TIFF (full resolution)

2400×2155, 576.2 KiB

Large GIF

1024×919, 77.9 KiB

Medium GIF

640×574, 41.2 KiB

Small GIF

320×287, 15.2 KiB