Imagery

"A touch of the hand and this burning would, on the instant, beautifully reverse itself."

Imagery is describing something with the five senses.The Sound of Thunder describes the time machine and the time travel with a lot of imagery. The machine gives light :" the light of the Machine on his thin face."  

We can feel the machine making noise: "The Machine slowed; its scream fell to a murmur. The Machine stopped." We can see out of the time machine: "First a day and then a night and then a day and then a night, then it was day-night-day-night." "The sun stopped in the sky." 

"Roses sweten the air" this is imagery because it describes to you what you can smell ' roses ' which means that the smell is comfortable and nice. The examples are good imagery because when you read the text you can image what is happening and what you can smell.