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Lemma
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It is a compass characterized by the possibility to better stabilize the open arms. Giacinto Carena (1853) describes it as “that which the opening is kept stabile by means of a metallic arch, that, soldered to one of the legs, enters and slides at a certain force with respect to the size of the other.”
 
note:
 
italiano
compasso fermo
francese
compas fixe