ICS. use, there was need of instruments for the measure- the back staff, but the first really serviceable instru- BY HERBERT T. WADE. As an interesting and important part of the study of ment of angles and for realizing or imitating the rela- ment was the quadrant, which was the ancestor of our the… … angles. Practically contemporary with the quadrant was the Astrolabes made by Bernardinns Sabeus of Padua (Italy) A mediseval astronomer using an astrolabe, where the entire circle was employed, and 1558 and by an unknown Italian craftsman astrolabe. where by the use of an alidade and a divided…
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