Here is a brace of vignettes by the Old Vignette Master ... short and sharp ... like a hypodermic!
only on objects weighing less than three pounds, five ounces and for distances into the past and future of twelve minutes or less. But it works."
The small-scale model looked like a small scale--a postage scale--except for two dials in the part under the platform.
Professor Johnson held up a small metal cube. "Our experimental object," he said, "is a brass cube weighing one pound, two point three ounces. First, I shall send it five minutes into the future."
He leaned forward and set one of the dials on the time machine. "Look at your watches," he said.
They looked at their watches. Professor Johnson placed the cube gently on the mach
Two well-written stories, the first about a time machine, the second about a sentry in an interstellar war. The author was so careful in what he said and didn't say in the second story, that the ending was easy to guess.
These are so short and the writing so good, that they are worth reading.
Two very short stories — 400 words or so each — taken from Galaxy Science Fiction, February 1954. Despite their brevity, they both manage to set up their twists perfectly.