“The agitator or pulsator is a propeller-like device, usually a concave disc fixed to the center, that creates the vertical-axis rotating action.”
“A pulsator or two were at work, and a slight rumble due to the action of the dynamo came to their ears.”
“Smith had also noticed that some cows would become tense and kick the pulsator claw, making it even more challenging to get attached, particularly for engorged cows.”