commercial (adjective): Of or pertaining to commerce or business.
mill hands (noun): The workers in a mill.
catwalk (noun): An elevated walkway.
thrumming (noun): The sound or action of something that hums or vibrates.
sawyer (noun): One who saws timber, especially in a sawpit.
yield (noun): A product; the quantity of something produced.
carriage (noun): A part of the machinary that wheeled the log forward toward the saw.
shotgun (noun): The front passenger seat in a vehicle, next to the driver; so called because the position of the shotgun-armed guard on a horse-drawn stage-coach, wagon train, or gold transport was next to the driver on a forward-mounted bench seat.
narrow-gauge trucks (noun): Railroad tracks that were close together.
powerhouse (noun): Any source of power, energy, or strength.
fire-barn (noun): Fire station where fire engines are kept.
throbbed (verb): To pulse with a steady rhythm.
nozzles (noun): Short tubes, usually tapering, at the end of a hose.
subsided (verb): Worn off.
immense (adjective): Gigantic, very large.