Optics Without MathematicsSociety for promoting Christian knowledge, 1883 - 124 páginas |
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Página 32
... feet ( 72 inches ) in diameter and 10 feet in focal length would form an image of the Sun 1 inch in diameter1 , in which the heat would exceed the ordinary solar heat in the proportion of 12 to 722 , more than 5000 times , and as in ...
... feet ( 72 inches ) in diameter and 10 feet in focal length would form an image of the Sun 1 inch in diameter1 , in which the heat would exceed the ordinary solar heat in the proportion of 12 to 722 , more than 5000 times , and as in ...
Página 59
... feet in diameter ; another by Parker at London at the end of the last century , with a diameter of 2 feet 8 inches , and another of 13 inches between it and PF , to obtain a shorter focus and therefore hotter image , which was -inch in ...
... feet in diameter ; another by Parker at London at the end of the last century , with a diameter of 2 feet 8 inches , and another of 13 inches between it and PF , to obtain a shorter focus and therefore hotter image , which was -inch in ...
Página 98
... feet focus , and then it was expected to bear a power of 62 times ; if 3 inches and ths aper- ture , about 50 feet for a power of 140 ; and a 6 - inch glass would have had more than 120 feet focus to magnify 216 times . But who ever ...
... feet focus , and then it was expected to bear a power of 62 times ; if 3 inches and ths aper- ture , about 50 feet for a power of 140 ; and a 6 - inch glass would have had more than 120 feet focus to magnify 216 times . But who ever ...
Página 99
... feet focus . Would you have had such a thing as a gift ? I imagine not . Dr. Derham , who had the care of it at one time , could not use it for want of a pole 100 feet or more high , which would have cost him £ 80 or £ 90 . The ...
... feet focus . Would you have had such a thing as a gift ? I imagine not . Dr. Derham , who had the care of it at one time , could not use it for want of a pole 100 feet or more high , which would have cost him £ 80 or £ 90 . The ...
Página 101
... feet , was erected at Mel- bourne in 1869 . A third kind , the best of all , was not only invented by Sir Isaac Newton , but executed with his own hands in 1671 , and that relic is still in the Library of the Royal Society . Here the ...
... feet , was erected at Mel- bourne in 1869 . A third kind , the best of all , was not only invented by Sir Isaac Newton , but executed with his own hands in 1671 , and that relic is still in the Library of the Royal Society . Here the ...
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Términos y frases comunes
angles of incidence aperture axis beautiful called candle circle cloth boards colour concave lens concave mirror conjugate foci converging convex lens course crossing crystal crystalline lens curious curves dark direction dispersion distance Double Refraction edge equal angles equi-convex eye-lens Fcap feet focal image focal length form an image fraction front happens hole inches larger lenses look looking-glass magnifying power microscope minute moon Newtonian reflector NORTHUMBERLAND AVENUE object object-glass opposite optical parallel rays perfect perfectly picture plane mirror polarised position prism produce PROMOTING CHRISTIAN KNOWLEDGE properties of light proportion radiant radius rainbow ray passes reflected rays reflecting telescopes refraction retina reverse right angles seen shorter focus side sideways sine Sir EDMUND BECKETT spectrum speculum sphere spherical spherical aberration straight line suppose surface telescope thing tion turned undulations violet waves wonderful
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Página 125 - ANCIENT HISTORY FROM THE MONUMENTS. This Series of Books is chiefly intended to illustrate the Sacred Scriptures by the results of recent Monumental Researches in the East. Fcap. 8vo, cloth boards, 2s. each. Assyria, -from the Earliest Times to the Fall of Nineveh. By the late GEORGE SMITH, Esq., of the British 'Museum.
Página 123 - The Stars in their Seasons. An Easy Guide to a Knowledge of the Star Groups, in 12 Maps.
Página 88 - Look upon the rainbow, and praise him that made it; very beautiful it is in the brightness thereof. It compasseth the heaven about with a glorious circle, and the hands of the Most High have bended it.
Página 123 - EVENINGS AT THE MICROSCOPE ; or, Researches among the Minuter Organs and Forms of Animal Life. By P. H. GOSSE, Esq., FRS A new edition, revised and annotated. Post 8vo Cloth boards 4 o FAN'S SILKEN STRING. By ANNETTE LYSTER, author of " Northwind and Sunshine,
Página 124 - CARE OF HEALTH. By the late EA PARKES, MD, FRS FOOD. By ALBERT J. BERNAYS, Professor of Chemistry at St. Thomas's Hospital. WATER, AIR, AND DISINFECTANTS. By W. NOEL HARTLEY, Esq., King's College. HEALTH AND OCCUPATION. By BW RICHARDSON, Esq., FRS, MD THE HABITATION IN RELATION TO HEALTH.