1. On the bottom of p. 30 it is stated that the chain tries to shorten in order to reduce the entropy. Actually, of course, it is trying to increase the entropy.
2. Page 79 Eq. 18.15. Note first that Al=W2, the volume of the inner solenoid. The symbol Df in the interior is a misprint; it should have been DH2=4pDM.
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