FOCAL • DICCIONARIO INGLES.COM • Definition of Focal

"Focal" Quotes from Famous Books

... observatory. 2. An astronomical clock, made by Mr Shelton. 3. An assistant clock, made by Mr Monk. 4. A transit instrument, made by Mr Bird. 5. An astronomical quadrant, by the same excellent artist. 6. A reflecting telescope, of two feet focal length, by ditto. 7. An achromatic refracting telescope, of three and a half feet, and triple object glass, made by Mr Dollond. 8. A Hadley's sextant, by ditto. 9. Another, by Mr Ramsden. 10. An azimuth ...

— A General History and Collection of Voyages and Travels, Volume 14 • Robert Kerr

... which there was no transportation. But, "Joe Johnston" held the movement to be necessary; and, by this time the South had learned to accept that what he thought must be correct. The great disparity in numbers, and the evident purpose of the Federals to make Richmond the focal point of attack, spoke plainly to that perfect soldier the necessity—coute que coute—of bringing his army within easy striking ...

— Four Years in Rebel Capitals - An Inside View of Life in the Southern Confederacy from Birth to Death • T. C. DeLeon

... for duplicating the cube. He also wrote a book περι πυρειων {peri pyreiôn}, On burning-mirrors, which probably discussed, among other forms of mirror, surfaces of parabolic or elliptic section, and used the focal properties of the two conics; it was in this work that Diocles gave an independent and clever solution (by means of an ellipse and a rectangular hyperbola) of Archimedes's problem of cutting a sphere into two segments in a given ratio. Dionysodorus gave a ...

— The Legacy of Greece • Various

Words linked to "Focal" : focal epilepsy, focus, central