...With regard to object-glasses,those of shortest focal length have the highestpowers, and the longest eye-pieces have the lowestpowers... 
Henry J. Slack 「Marvels of Pond-life」
...In nature theyare out of focus when one is looking at an object, but in apainting the background is necessarily on the same focal plane asthe object...
Harold Speed 「The Practice and Science Of Drawing」
...The focal point seemed about a thousand feetoverhead...
Raymond King Cummings 「Wandl the Invader」
...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」
...We may apply eye-glasses of different focal length...
Richard A. Proctor 「Half-hours with the Telescope」
...The Huygens eyepiece consists of twoplano-convex lenses whose focal lengths are in the ratioof three to one...
Garrett Serviss 「Pleasures of the telescope」
...Both lenses have their convex surfaces toward theobject glass, and their distance apart is equal to half thesum of their focal lengths...
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」
...'s work was continued for stars between δ = -2° andδ = -23° by , according to much the same plan, but witha larger instrument (aperture 159 mm, focal length 1930 mm, magnifyingpower 26 times)...
Carl Vilhelm Ludvig Charlier 「Lectures on Stellar Statistics」
...5 feet focal length, and another, of 12 inches diameter and 18 feetfocal length, for Lamont, of Munich...
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」
...As a camera obscura is actually atelescope, magnifying objects in proportion to the focal length of thelens employed, he may be said to have first seen these spots with theaid of an optical instrument...
David Brewster 「The Martyrs of Science, or, The lives of Galileo, Tycho Brahe, and Kepler」
...On the other hand, the eye-glass mustnot be of such small focal length that the image appears indistinct andcontorted, or dull for want of light...
Richard A. Proctor 「Half-hours with the Telescope」
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