Charles Hubert’s text is a for understanding how to start, stop, reverse, and regulate electromechanical machines. However, its age and the generally poor quality of circulating PDF scans make it a supplementary resource, not a primary text for a modern course. If you find a high-resolution, bookmarked PDF (sometimes from university repositories), it is worth keeping. Otherwise, seek a later edition of Chapman or Sen for a cleaner digital experience.

Would you like guidance on where to locate a legitimate, high-quality PDF (e.g., via institutional access) or a comparison of specific chapters from Hubert vs. a modern text?