Caterpillar Diesel 50, with bulldozer building a road 24 miles back into inaccessible mountain country Santa Barbara National Forest U.S.A. (Photo W. Adams)
Character of the bark as it is brought to the factory from the forest. On the right is a piece about 4' in length stripped from the tree in one section.
Chemical 'cooking' of wood chips yields cellulose pulp for gun cotton. Nitro-cellulose also made from wood pulp is the main constituent of modern high propellant explosives. Glycerol obtained from wood is a source of nitroglycerin.