Electrical papers
Oliver Heaviside's collected technical papers on electromagnetism, telegraph signalling and operational calculus, issued in two volumes by Macmillan in London in 1892 for mathematical physicists and telegraph engineers. The plates are line graphs of transient and wave curves on ruled grids with lettered axes and numbered branches, several printed white-on-black, giving designers clean curve families, negative-plate contrast and small italic labelling.
