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That would be "The Sands of Time" (1937) by P. Schuyler Miller.

I was always interested in what might be called the history of time-travel, which is almost a contradiction in terms when you think of it.

There was "Missing One's Coach," published anonymously in 1838 (!)

"A Tale of the Ragged Mountains" by some guy named E. A. Poe (1844)

"The Clock that Went Backward" by Edward Page Mitchell (1881)

Wells' prototype story, "The Chronic Argonauts" (1888) plus "The New Accelerator," about people "speeding up" through time.

"The Man Who Lived Backwards" by Allan Upward (1905) -- the protagonist is aware of time reversing around him; easy to describe these days when you can run a film in reverse but novel then.

The House on the Borderland (1908) by William Hope Hodgson passes through amazing cosmic vistas to the end of the universe and back -- between the creepy chapters of "The Swine-Things" assaulting the hero's house in western Ireland.

For strange permutations of Time Travel, there's "The Hounds of Tindalos" by Frank Belknap Long, with its "angular time" vs. our curved Einsteinian space.

In Lovecraft's "The Shadow out of Time," the astonishing history of the Lovecraftian universe overshadows the time travel aspect. I consider it one of the great Sense of Wonder tales, but some might find it a bit "busy", since just about every Cthulhu thingy, planet, person and name ends up in it.

"The Man Who Walked Home," by James Tiptree Jr. is a pretty bizarre tale about a man caught in a catastrophic explosion that not only destroys civilization but leaves him intersecting our world/time about once a century.

"The Very Slow Time Machine" by Ian Watson is about a time traveller who has to live in reverse in the past to travel an equal distance into the future.

I suppose Andre Norton is quaint and old-fashioned, but I loved her Time Traders series: The Time Traders, Galactic Derelict, The Defiant Agents, and Key out of Time -- plus a couple more she added late in life.  And if you count going "sideways" into alternate histories, there were also The Crossroads of Time and Quest Crosstime.

That ought to do for a bit!