A voyage in space; a course of six lectures "adapted to a juvenile auditory" delivered at the Royal Institution at Xmas 1913 (1915)
Turner, Herbert Hall, 1861-1930 · London Society for Promoting Christian Knowledge · leaf 258
five photographs with different exposures.The first exposure is to be only for one second; thiswill suffice to show the brightest parts of the coronathough not the faint portions; but even if the THE SUN 237 eclipse only lasted one second before (say) cloudscame up, the astronomer would have got… … The coelostat and telescope used by the Astronomer Royalin Japan in 1896.(By a Japanese Artist.) faint parts of the corona. A ten-second and two-second exposure complete the programme of five.Altogether, therefore, the camera will be open for1 + 5 + 40 + 10 + 2 = 58 seconds, and since thewhole…
Astronomy -- Juvenile literature
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
