This report discusses forests and treats the topic in four parts. The first part describes the life of an individual tree, and the second describes individual trees as parts of a forest. The third and fourth parts discuss forests as communities of trees and methods for preventing destruction of forests.
All carbon steel that is used in tools, springs,
and machine parts where tempering is necessary undergoes
three distinct heat treatments: first, heating for forging;
second, heating for hardening; and third, heating
for tempering.