The boiler is designed for small quantities of asphalt and at nearly different place. In city area where wood is not justified to use, the diesel engine is at function. One burner and air blower make a stream of hot gases passing through pipe.
This is a wood fire boiler. It is useful for preparing small quantities of asphalt at different place where it is difficult to attend by a heavy plant, country fire wood is used us fuel. And as such it is useful for patch work carried on by municipalities' sub-burn area.
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