How much does the Time Patrol know about alternative timelines? First, they have experienced some:
"A man from the Scientific Renaissance had another point to make. Granted, the survivors' plain duty was to restore the 'original' time track. But they had a duty to knowledge as well. Here was a unique chance to study a whole new phase of humankind. Several years' anthropological work should be done before - Everard slapped him down with difficulty. There weren't so many Patrolmen left that they could take the risk."
-Poul Anderson, "Delenda Est" IN Anderson, Time Patrol (Riverdale, NY, 2010), pp. 173-228 AT 8, pp. 220-221.
Wanda Tamberly is shown records of:
"'Consequences of time gone awry.'"
-Poul Anderson, The Shield Of Time (New York, NY, 1991), PART FOUR, 1990 A. D., p. 253.
When Keith Denison has returned from the alpha timeline, he says:
"'In due course I may write a book or two.'"
-The Shield Of Time, PART SIX, 18,244 B. C., p. 365.
Secondly, the Patrol analyses its own timeline:
"'...that particular milieu is critical. Mr. Gordon showed me the analysis. I couldn't follow all those symbols, but he said it was a very dangerous century to tamper with.'"
Poul Anderson, "Brave To Be A King" IN Time Patrol, pp. 55-103 AT 2, p. 62.
If the analysis identifies a moment at which the timeline is most likely to be altered, does it also indicate the course of events in a potential altered timeline? We will return to this thought.