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 9 values, 0 being unpaired): …instead of the conventional mechanical typewriter-paired values of: …and the electric typewriter-paired values of: The shifted values of digits in a bit-paired keyboard thus differ from mechanical typewriters only in omitting _ and shifting the remaining characters left. Electric typewriters differ in replacing " with @, _ with ^, and ' with *. This is because smaller characters hit the paper with less force, and consolidating smaller characters such as and into a pair on a single key avoided needing to adjust the force based on shift state. Overall this results in the following comparison