Science Friction Burns My Fingers!
and the third?
Well, what else can one say - except it's by Shaver!
"Shooting Destination Moon" from Astounding July 1950
"Making Worlds Collide" from Astounding Nov. 1951
My issue of Search containing this article is missing the cover, so here's a nice illo for Shaver's story "The Crystalline Sarcophagus" from Amazing Stories of May 1947.
Shaver Mystery Part 6 - "The Cyclops"