56 ELEMENTARY WOODWORKING 
spiked shoes and are armed with long poles having sharp 
steel points. When such a jam breaks up, the crashing 
of the logs and rush of water can be heard for miles. 
Having finally reached the mill, the logs float in the 
river, inclosed in a log boom, until the mill men are 
ready to saw them into planks. 
Fic. 69. A Modern Sawmill 
The boom consists of logs chained together and 
stretched across the river just as a fence is built on 
land to inclose cattle. 
The sawmill of to-day is a mass of automatic 
machinery, and after the log enters it is not touched 
