A system of natural philosophy, designed for the use of schools and academies (1845)
Moffat, J[ohn] M. [from old catalog] · Philadelphia, E. C. Biddle · leaf 418
ctice. There arealso various modifications of the portable camera obscura, amongthe more convenient of which is that represented in the annexedfigure. What led Newton to the examination and improvement of the Gre-gorian telescope ? What is the nature of that instrument ? Explain the diagram… … 256. It consists of a square box A,with a circular aperture in front,into which is fitted a short tube, a,having- at its extremity a convexlens. This tube is made to slidebackward or forward, so that it may-be adjusted to the proper point fornear or distant objects. Then therays Q P, proceeding…
Physics
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