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 71
nd other toys for theamusement of children, formed onsimilar principles. Thus likewise along stick or ruler, placed loosely ona bench or table, with more than halfits length projecting beyond the edge of the board, may be made How is the position of centre of gravity illustrated in the manner… … OF SUPPORTING THE CENTRE OF GRAVITY. 69
Physics
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