Chinese 80mm/3.2"inch refractor telescope
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Chinese 80mm/3.2"inch refractor telescope
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An old engraving showing a refracting telescope, Washington DC, USA c.1880. It is from a Victorian mechanical engineering book of the 1880s. In 1870 the federal government gave the head of the
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Chinese 80mm/3.2"inch refractor telescope
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Light, a textbook for students who have had one year of physics. e telescope.—44. Magnifying power.—45. Ramsden eyepiece.—46. Opera glass.—47. Prism binocular.—48. Reflecting telescopes.—49. Simple microscope.—50. Compound microscope.—51. Projection ...
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