When I was a child we did this on a smaller scale with a magnifying glass that we got at the 5 and dime. We could put ours in a pocket or book bag.
Ah yes, with a sunny day and a good magnifying glass, no anthill was safe..........
“When I was a child we did this on a smaller scale with a magnifying glass that we got at the 5 and dime.”
School band room. One of those cheap magnifying glasses, a nice sunny windowsill, and a roll of caps! Fun!