 David C. Lindberg (1997) has given a succinct summary of Bacon’s model for an experimental science [RBS]. He sees four main aspects. First, Bacon’s perspectival theories were not his own creation. He took the best available materials from Greek and Islamic scholars and produced his own synthesis. Second, there is much evidence that Bacon himself did mathematical work and experiments with visual phenomena such as pinhole images and measurement of the visual field. Third, as seen above, Bacon correctly calculated the maximum degree of elevation for the rainbow. Fourth, the experiments in Bacon, especially in the Perspectiva served “theoretically significant functions” by supplying observational data that required explanation in terms of a given optical theory. The usual role of experiment in Bacon is to “confirm, refute, or challenge theoretical claims.”