COMPRESSOR, ROTARY, POWER DRIVEN. A MACHINE USED TO COMPRESS AIR OR GAS
FROM AN INITIAL INTAKE PRESSURE TO AHIGHER DISCHARGE PRESSURE. THE
ACTION IS ACCOMPLISHED BY ROTATING VANES, OR REVOLVING SPIRALS. IT IS
DESIGNED TO BE DRIVEN BY SOME MECHANICAL MEANS, AND MAY BE EQUIPPED
WITH A DEVICE TO INCREASE THE INITIAL PRESSURE.
