Despite being 70 years old, the PDF of Tsien’s original 1954 edition is sought after because:
Halfway through, a student interrupted—someone who lived online and had downloaded “tsien_cybernetics.pdf” the night before, poring over her equations. “Professor,” he asked, “how do you guard against the systems that learn the wrong thing? If a prosthetic learns to accept cruelty—say, to ignore pain—what then?” engineering cybernetics tsien pdf top
If you obtain the PDF, these are the "top" chapters and concepts researchers typically reference: Despite being 70 years old, the PDF of