have interview next week so should actually use my own interview practice resources myself
found various sites where you can learn how to contract a cross staff so added them here for record
brilliant old book on renaisssance scientiifc instruments just look at that tychos tranverse scale http://articles.adsabs.harvard.edu//full/1986JBAA...96..353C/0000354.000.html
a build your own cross staff from instructions http://www-spof.gsfc.nasa.gov/stargaze/Scrostaf.htm like this the best
using a cross staff to measure angular separation http://www.education.com/science-fair/article/angular-separation/
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