A rectangular portion seen below the escapement wheel is known as :ADog blockBPinion wheelCAlignmentDCarriageAnswer: A. Dog block Read Explanation: Dog Block A rectangular portion seen below the escapement wheel is known as : Dog block Two dogs are there in dog block Loose dog Rigid dog Movement of carriage is controlled by Loose dog and Rigid dog Metal piece which always seen holding the tooth of escapement wheel when the machine is at rest is called Loose dog If there is no loose dog the carriage dashes towards the left of the carriage. Loose dog is movable as it has loose dog spring. Loose dog helps in step by step movement. Read more in App