"Now as the vacuum-underground rushed him through the dead cellars of town, jolting him..." (78). The figurative language identified in this sentence is a metaphor. Montag is comparing the subway/train to a vacuum in a dead cellar. Bradbury used this because he wanted the readers to imagine how dead and empty the tunnel and train was. He wanted the readers to see how fast the train was going, also.
Shutter Speed: A Beginner's Guide... I've always believed that in photography, you should avoid getting bogged down in the technical side of your hobby, and focus on developing your creative talent. However, there are certain technical elements that are essential to getting a good photo - shutter speed is one of them