Palmer notation or afterwards; hence 3/ is ┘ and /5 is ┌ Daniel Johnson has put together a Palmer Tooth Notation TrueType font called FreePalmer. It can be downloaded: handwritten Palmer tooth notations is available for download as well One advantage of Palmer notation is that it can produce a very graphical image, akin to a 'map' of the dentition; tooth transpositions or edentulous spaces can easily be depicted if desired. It would also be feasible to introduce additional alphabetic characters or other symbols, for example to denote supernumerary teeth or bridge pontics, to which a purely numerical method such as the
Palmer drought index using corresponding positive numbers. Palmer also developed a formula for standardizing drought calculations for each individual location based on the variability of precipitation and temperature at that location. The Palmer index can therefore be applied to any site for which sufficient precipitation and temperature data is available. Critics have complained that the utility of the Palmer index is weakened by the arbitrary nature of Palmer's algorithms, including the technique used for standardization. The Palmer index's inability to account for snow and frozen ground also is cited as a weakness. The Palmer index is widely used operationally, with Palmer maps published