In last month’s column [“Automatic Pumpdown Systems,” Nov. 5], we talked in general about the automatic pumpdown cycle and why it is the only sure remedy for refrigerant migration to a compressor ...
An Introduction to the Theory of Feed-back and Feed-back Control Systems. By A. E. De Barr. (The Institute of Physics and the Physical Society Monographs for Students.) Pp. vii + 118. (London: Chapman ...
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