Screens can be static, mechanically vibrated or electro-mechanically vibrated. The tubes are carved so that they have a distinctive resonant pitch when being vibrated. The magnetic armature vibrated up and down at high speed, producing an alternating magnetic field. When these quills are vibrated, they produce a hiss-like rattle. This organ has membranes which are vibrated to produce ultrasonic sounds. Bombers were noisy, cold, and vibrated badly. They vibrated excessively due to imbalances in the combustion chambers. Thin bones by the swim bladder can be vibrated by specialized sonic muscles. Zoom vibrated his hand into her head, solidifying it just enough to kill her. The object is vibrated at a specific frequency. Upon testing, it vibrated so much that it broke the test bench. At high speeds they were hard to steer and vibrated heavily. The mold can also be vibrated to expel bubbles. Additionally some complex forms cannot easily be vibrated. During more adventurous maneuvers the canopy vibrated.