Chicago : Engineering and Contracting Pub. Co. · leaf 268
and the hole bored from6 to 12 ins. below the surface. A piece of ironheated to a white heat is then dropped intothe hole and a blast of air turned upon it byinserting a pipe attached to the end of thehose which is of less diameter than the holebored in the stump. The large diameter ofthe hole… … I ig. 4—Diagram Showing Method of Pre-paring a Stump for Burning. This machine is still in the experimentalstage. A few have been successful in operat-ing it, while others have pronounced it a fail-ure. It is thought that if this machine is per-fected it will be a cheap and economicalmethod of…
Buildings
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