Quiet, Please! was a radio fantasy and horror program created by Wyllis Cooper, also known for creating Lights Out. Ernest Chappell was the show's announcer and lead actor. Quiet, Please! debuted June 8, 1947 on the Mutual Broadcasting System, and its last episode was broadcast June 25, 1949, on the ABC. A total of 106 shows were broadcast, with only a very few of them repeats.
"The Thing on the Fourble Board" is one of radio horror's greatest gems. Chappel relates a story about being a roughneck oil driller. His crew drills a hole into the prehistoric earth that unleashes an invisible creature, one that kills the workers until only Chappel remains. The creature becomes visible when paint is tossed on it, revealing a human/ insect combination that so unhinges the narrator that he... well, I wouldn't want to spoil it by saying more.
the "fourble board" of an oil derrick is a narrow catwalk that is as high up as four lengths of drilling pipe placed vertically (two lengths of pipe are a "double", three are a "thribble" and four are a "fourble."