A system of natural philosophy, designed for the use of schools and academies
A school and academy physics textbook by J. M. Moffat, published in Philadelphia by E. C. Biddle in 1845 for American students. The 115 wood-engraved figures are small line diagrams of levers, pulleys, inclined planes, pumps, prisms and lettered ray paths, useful as spare mechanical schematics or lettered geometric marks for print and screen.
