Planck's law In 1880, André-Prosper-Paul Crova published a diagram of the three-dimensional appearance of the graph of the strength of thermal radiation as a function of wavelength and temperature. He determined the spectral variable by use of prisms. He analyzed the surface through what he called "isothermal" curves, sections for a single temperature, with a spectral variable on the abscissa and a power variable on the ordinate. He put smooth curves through his experimental data points. They had one peak at a spectral value characteristic for the temperature, and fell either side of it towards the horizontal axis. Such spectral sections are
Bit-paired keyboard between bit-paired keyboards and (electric) typewriter-paired keyboards: they agree in 1, 3, 4, 5, and differ in 2, 6, 7, 8, 9, 0: bit-pairing replaces @ with " (position 2), removes ^ (position 6, shifting later characters left), and replaces * with ' (position 8/7); there is also no shifted value for 0, as this corresponds to space, which is covered by the space bar. This corresponds in the ASCII table to the following columns (displayed as rows here): There are also less conspicuous differences in the symbol keys: bit-paired and typewriter-paired keyboards agree on (rows 12, 14, and 15)