Hepworth, Thomas Cradock, -1905 · London : Hazell, Watson, and Viney · leaf 196
184 EVENING WORK FOR left respectively. By this means the spot of light can be most exactly centred. This lantern presents the most … Fig. 66. complete and perfect projection apparatus ever devised, and is designed principally for use in science schools and colleges. It is only those who have had experience of science teaching who know the value of an experiment both to
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Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
