Cover art
Leinster, Murray. Time Tunnel. Pyramid 1964.

Leinster, Murray. Time Tunnel
Divergence: 1804 CE
What if: Napoleon established a permanent dynasty.
Summary: Men from our world use a time tunnel to investigate odd historical memories and a mysterious scientist in 1804.
Comments: Not to be confused with Leinster's The Time Tunnel or Timeslip! A Time Tunnel Adventure.
Published: Pyramid 1964.