Instruct: Classify a review as either positive or negative.
Query: DC Machines made easy

M.G.Say has the incredible ability to explain principles of operation in such a way that the reader can grasp it with no effort. From here Say takes the reader into the practical side of the world. Constructional detail and design aspects are highlighted like nowhere else. He also gives one a glimpse into the future. The amazing story is that this is still the best book on DC machines for people who have to operate or repair these machines.