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 118
void thisgradual deterioration, mirrors have been made re-cently of glass which is then silvered with a thin filmon the front surface. This film also tarnishes after JOURNEYING BY TELESCOPE 97 a time, but it can easily be removed with a little acid,and then a new bright film can be put on so that… … The great Five-foot Telescope being taken up Mount Wilson. Rosses (six feet), but still a great advance on anyprevious silver-on-glass mirror. With it he tooksome wonderful pictures of nebulae and other objectsof the heavens, but he did not live long after he hadmade it, and the telescope was sold…
Astronomy -- Juvenile literature
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
