Final answer:
The rhetorical devices used are hyperbole, due to the exaggerated comparison of wealth, and Biblical allusion, as the comparison references the riches of Job from the Bible.
Step-by-step explanation:
The sentence "To describe the wealth of Colonel Lloyd would be almost equal to describing the riches of Job" employs the rhetorical devices of hyperbole and Biblical allusion. Hyperbole is a figure of speech that involves exaggerated statements or claims not meant to be taken literally, used to create a strong impression. A Biblical allusion is a direct or indirect reference to the Bible, which is assumed to be recognizable to the reader. In this context, the comparison amplifies Colonel Lloyd's wealth by equating it with the prosperity of Job, a well-known Biblical figure who was initially very wealthy.