This section is from the book "An Elementary Outline Of Mechanical Processes", by G. W. Danforth. Also available from Amazon: An elementary outline of mechanical processes.
This machine is constructed with the same method of cutting provided for the hand planer, but it is a much heavier machine, and is used for surfacing rough boards and timbers. Its table is made in one flat piece fitted to be raised or lowered readily to suit the thickness of the board or timber passing under the knives. The work, resting on the table, passes under the cutter head, also it passes under rollers which hold it down before and after it reaches the cutter head. These rollers feed the work along the table.
 
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