The Mesavage and Girard form classes used to classify the trees to decide which volume table should be used.
These volume tables are also based on different log rules such a Scribner, Doyle, and International 1⁄4 in (6.4 mm) scale.
In order to be effective, the proper form class must be selected as well as accurate DBH and height measurements.
[1] However, it was not carried out until 1846 when the Bavarian Government conducted an extensive study which was used to find the volume of entire stands rather than single trees.
From this, variations grew based on variables including growth rate, species, and site index.