This can be the leading cause for foul HVAC odors for many homeowners, which raises concerns about indoor air quality. Another indicator of an indoor air quality problem is the smell of dirty socks. Although this smell may be coming from the air conditioning unit, it is not actually the unit that is the problem.
Device. 1  Ratchet (device), a mechanical device that allows movement in only one direction. 2  Ratchet, a tool also known as a socket wrench. 3  Ratchet (instrument), a type of music instrument.
Rat torture is a common form of punishment and that's alluded to in the book: It was a common punishment in Imperial China, said O'Brien as didactically as ever. I think part of the symbolism of rats is simply that they make for a realistic torture scene.