...With that apparatusI could throw a beam of negativeheat with a focal point which Icould adjust at will... 
Various 「Astounding Stories of Super-Science, March 1930」
...The focal point seemed about a thousand feetoverhead...
Raymond King Cummings 「Wandl the Invader」
...Admitting the light of the sun through a narrowslit in a window-shutter, an inverted image of the slit can be thrown, by alens of suitable focal length, on the wall opposite...
George Forbes 「History of Astronomy」
...In 1665 Cassini, with a fine telescope, 35-feet focal length, observedmany spots moving from east to west, whence he concluded that Jupiter rotateson an axis like the earth...
George Forbes 「History of Astronomy」
...The diameter of this object-glass isthirty-six inches, and its focal length is fifty-six feet two inches...
Robert Stawell Ball 「The Story of the Heavens」
...The first was made with a Newtonian telescope something less than seven feet focal length, a power of 222, and an aperture of four and a half inches...
Edward Singleton Holden 「Sir William Herschel: His Life and Works」
...By reflection from this mirror the focal plane and theimages are shifted to F, where they may be examined fromone side through the magnifying glass E...
George C. Comstock 「A Text-Book of Astronomy」
...—The amount by which a giventelescope magnifies depends upon the focal length of the objective(or mirror) and the focal length of the eyepiece, andis equal to the ratio of these two quantities...
George C. Comstock 「A Text-Book of Astronomy」
...By moving it to and fro a little you will be ableto find a distance, corresponding to the focal length of thelens, at which a picture of the window is formed on thepaper...
Garrett Serviss 「Pleasures of the telescope」
...The equivalent focal length of a positive or Ramsden eyepieceis equal to three fourths of the focal length of eitherof the lenses...
Garrett Serviss 「Pleasures of the telescope」
...Next let us return to the focus and then movethe eyepiece gradually inside the focal point or plane...
Garrett Serviss 「Pleasures of the telescope」
..., focal length of200 mm...
Wm. Gaertner & Co. 「Astronomical Instruments and Accessories」
...5 feet focal length, and another, of 12 inches diameter and 18 feetfocal length, for Lamont, of Munich...
George Forbes 「History of Astronomy」
...But Lord Rosse’s 6-foot reflector, 54feet focal length, constructed in 1845, is still the largest ever made...
George Forbes 「History of Astronomy」
...These he fixed in apiece of organ pipe, which served the purpose of a tube, the glassesbeing distant from each other by the difference of their focal lengths...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...'The whole immense powerof the telescope was applied, and to its focal image about one half ofthe power of the microscope...
Richard A. Proctor 「Myths and Marvels of Astronomy」
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