Side-lights on astronomy and kindred fields of popular science; essays and addresses (1906)
Newcomb, Simon, 1835-1909 · New York Harper · leaf 107
Takethe cube of the diameter in inches, or. which is the same thing,7 87 SIDE-LIGHTS ON ASTRONOMY The tube for the telescope may be made of paper,by pasting a great number of thicknesses around along wooden cylinder. A yet better tube is made ofa simple wooden box. The best material, however,… … A VERY PRIMITIVE MOUNTING FOR A TELESCOPE kept, the better. The work of fitting the objectiveinto one end of a tin tube of double thickness, andproperly adjusting it, will probably be quite withinthe powers of the ordinary amateur. The fitting of calculate the contents of a cubical box which would…
Astronomy
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