er obfervationis mcthodum techn. i. hujus capitis traditam. Solet tamenhorologium polare magis ejusmodi globo, quam uUum aiiud congruere, cum &univerfale fit, & facile conftruatur. Denique duo hcmifphxria inviccm aptccoagmentabiSj itautnullumdivifionisindiciumadvertiqueat, quodoptime,… … Simili plane Artificio poteft cylindrus horodi(^icus conftrui, ut vides in JB CDfig.3.incujus unaniedietateplanaobfcuratalior^ fimiliter, ut indicatum eft, infcn- a?o cTbantur, atqueloco ftyli ad competentem longitudincm oblonga cayitas fubtilisfi- dri hom-materebra interaturj deindeduacpartes…
Optics, Geometrical · Optical instruments
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