Principles of physics
A secondary-school physics textbook by Frank M. Gilley, published in Boston by Allyn & Bacon in 1901 for American classroom use. The 71 figures are spare line diagrams of laboratory apparatus and circuits—flasks over burners, stopcocks, Wheatstone bridges, levers on supports—with hatched cross-sections and italic letter labels, useful as schematic vignettes or as sources of hatching and labelled line conventions.
