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isoscope
isoscope n.
Brit. 
/ˈʌɪsə(ʊ)skəʊp/
, /ˈʌɪsə(ʊ)skəʊp/U.S. /ˈaɪsəˌskoʊp/
[see -scope comb. form] an instrument devised by Donders to determine the actual angle between directions which to the eye appear both vertical or both horizontal./ˈaɪsəˌskoʊp/Π
1876 S. Kens. Mus. Catal. No. 3989 Isoscope.
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