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story identification - Collection of short stories with various theories about time travel



Back in the 1960's-70's I read a book of short stories, each using a different theory or perspective about time travel. Not all were built with today's predominant idea that a change in the past makes a change in the present.


One story was about a Russian scientist who was researching time travel, getting close to understanding it. He was arrested and about to be executed by a firing squad. Just before being shot, he has an insight about his work. He says "Wait." And time almost stands still. The bullets are still in the air, out of the rifles, have not yet reached him. He leaves the site, visits his wife and others, has difficulty moving things, finally decides it is not worth continuing his life like this. So he goes back to finish being shot. He uses one of the lead bullets to write his newly thought-of formula on the wall. Then he stands in front of the bullets and says "OK". Time resumes and he is shot/killed. The head officer at the execution sees the writing and tells one of the soldiers to clean it.


Another story involves a character sitting in his living room. His future (or past) self rushes in with a time-travel machine and tells him he has to hurry. He gives instructions about going into the future, visit a museum where he can get a time-travel machine. At the museum, he see that he himself is the inventor of the time-travel machine, and he sees several models - some early/primitive and some later/advanced. The museum alarm rings and he has to quickly get the model that he is standing near and leave. He goes back home, finds himself sitting in his living room.


I'm hoping to find the whole book of stories. But any help finding either of these two stories might also help.




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