Spectrograph: Listen & Download Spectrograph .mp3 Error! Change your browser, please! ⇓ Download Stitching machine ⚠ Mechanical lift ⚠ Forklift truck moving away ⚠ Automatic telephone switch ⚠ Forklift approaching ⚠ Small centrifuge ⚠ Spectrograph ⚠ Electric welding ⚠ Circular knitting machine ⚠ Automatic folder ⚠ Robotic assembly line ⚠ Canning machine ⚠ ★★★★★