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Millard County Chronicle | 1911-05-18 | Page 8 | About the Big Telescopes

Type issue
Date 1911-05-18
Paper Millard County Chronicle
Language eng
City Delta
County Millard
Rights No Copyright - United States (NoC-US)
Publisher Digitized by J. Willard Marriott Library, University of Utah
ARK ark:/87278/s6c006zz
Reference URL https://newspapers.lib.utah.edu/ark:/87278/s6c006zz

Page Metadata

Article Title About the Big Telescopes
Type article
Date 1911-05-18
Paper Millard County Chronicle
Language eng
City Delta
County Millard
Page 8
OCR Text ABOUT THE BIG TELESCOPES Difference Between Big Glass at One End and Little One at the Other. People sometimes wonder why a telescope has two glasses, one at the big end and one at the little end, and they want to know the difference. The glass at the big end Is to gather light It Is simply a big eye. If It l a hundred times bigger than the eye In your head It will gather a hundred times more light. It gathers the rays of light coming from a star and bends them all Into a common meeting point, called a focus, which Is a picture pic-ture of the star. You can look at this picture of the star with your naked eye If you like. Hut you can see It better and examine It more closely If you look at It with a small mngnl f.vlng glass. And this Is the glass at the small end of the telescope. It magnifies, the picture made by the big glass at the other end of tie Instrument. Instru-ment. All telescopes are built on this principle. Sir William llerschell was the first to arrange matters a little dlff-rently. He took away the glass from the big end and admitted the rays coming straight Into the tube in parallel lines. Then nt the bottom of the big tube he placed a bright con rsvo mirror, made of burnished metal. When the entering rays fell upon this mirror they were again bent to a point called a focus, which was th picture of the star. To look at this picture he had to place the little msgnlfylng glass at the side of the tube, becauae the mirror had stopped 'ip Its lower end
Reference URL https://newspapers.lib.utah.edu/ark:/87278/s6c006zz/5154778