The cover image has been repaired.

All inconsistencies were left unchanged, like:

• Bellfounder -- Bell-founder
• framework -- frame-work
• recast -- re-cast
• recasting -- re-casting

The following changes have been made:

• p. 6 “pourtrays” replaced by “portrays”.
• p. 159 “,” removed.
• p. 159 “,” replaced by “.”.