First log readings gave no reason to anticipate any difficulty.

Resistivity and Conductivity log readings are influenced by the logging conditions.

In a series of thin beds, the log reading is a volume average of the contributions within the sphere.

Subsequent reports and radioed log readings were, for Kruger, unusually terse and formal, and surprisingly infrequent; but earth-to-ship contact at twenty-minute intervals had been acknowledged.

As I had been unable to take a sight I didn't know our exact position - and while dead reckoning and log readings wore all very well in their way, I was beginning to become perturbed.