Science Fair Project Encyclopedia
Alhidade
The Alhidade is the part of a theodolite that rotates around the vertical axis, and that bears the horizontal axis around which the telescope (or visor, in early telescope-less instruments) turns up or down.
In a sextant the alhidade is the turnable arm carrying a mirror and an index to a graduated circle.
Arabic: al-idhâdah = "ruler"
Last updated: 08-06-2005 07:33:38
10-26-2009 08:16:03
The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details
The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details