Sawdust, slabs, stumps and large quantities of logs are wasted.
This insulation generally consists of materials such as charcoal, silicate cotton, granulated cork, small pumice, hair-felt, sawdust, &c., held between layers of wood or brick, and forming a more or less heat-tight box.
It is found that the sawdust obtained from soft woods is the best material for use in this process.
The ground was sawdust and the pebbles scattered around were hard knots from trees, worn smooth in course of time.
The sawdust of the numerous mills is collected for use in the manufacture of paper.