ommunis bafis eft cir-culus 5 ut A B C D conflatur cxABCIA 6c ADCIA/ Bafiscommunis cfl AIC. 3. Lens ex fegmentis itquali-biis dicitur,cumfedio eflafph^-ris a^qualibus, ut A B C D mon-fttat; nam fegmenta A B C &:ADC funtaequalia. 4. Lens exfegmentis inarqua-hbuscfl, cum (cdiio efl exfphse-ris… … comprehenrum. Sic GDH eft ^ens dimidia» qu^ comprehenditur fuperficie GDH,& cijculo GTH five cujus linea GTH eft diameter. 6. Lens coQvexa dicitufj vel convexo-eoncava five convexa urtinqu^ , quae exduabus fupeificiebusfphajricis convcxis Componitur, ut A B C D A, qux componitut ex A B C &…
Optics, Geometrical · Optical instruments
Internet Archive · Getty Research Institute · Public Domain Mark 1.0. Free to use for anything.
![An illustration from A treatise describing and explaining the construction and use of new celestial and terrestial globes; designed to illustrate ... the phoenomena [sic] of the earth and heavens, and to shew the correspondence of the two spheres. With a great variety of astronomical and geographical problems occasionally interspersed (1766)](https://img.insideoutlibrary.com/img/200/ia-treatisedescribi00adam-116-8.webp)
