The History of the Telescope
"This book is one that I can heartily recommend." — Sir Harold Spencer Jones, F. R. S., formerly Astronomer Royal
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achromatic amateur aperture ratio appeared astronomers bright camera Cassegrain Cassini cast centre century colour concave construction convex curvature deﬁnition diameter difﬁculty disk Dollond double stars equatorial equatorial mounting eyepiece feet focus ﬁeld ﬁgure ﬁlm ﬁnal ﬁnd ﬁne ﬁnished ﬁrm ﬁrst ﬁtted ﬁve ﬁxed ﬂat focal length Fraunhofer Galileo Greenwich Guinand Hale Herschel Huygens Ibid inches aperture instrument invention later lbid lens lenses light London magniﬁcation meridian metal method micrometer minutes of arc mirror moon motion Mount Wilson Mount Wilson Observatory nebulae Newtonian object-glass objective observations Observatory optical opticians Paris Observatory Peter Dollond Phil photographic planets plate polar axis polishing prism quadrant Ramsden reﬂecting telescope reﬂector refracting refractor right ascension Ritchey rotated Royal Society satellites Schmidt scientiﬁc slit solar spectra spectrograph spectroheliograph spectrum specula speculum speculum metal spherical aberration stellar surface Trans transit circle Troughton tube Vide Ref Yerkes