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 384
contrived by Dr. Paris.:): … 150. It consists of a number of circular cards, having silkstrings attached to their opposite edges, as represented in the pre-ceding figures. By these strings, one of the cards being twirledround with a certain velocity, both sides of it will be visible atthe same time, and any objects traced on…
Physics
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