"Listen, you Venusian clunk," exploded Roger, "I built this thing, so I know what I'm doing!"
"But, Roger—" protested Astro.
"Twenty minutes!" said Roger, and twisted the set-screw in the fuse. "O.K., it's all set. Let's get out of here!"
The two cadets raced back to the jet boat and blasted off immediately. Once in space, Astro turned to Roger.
"Better check in with Major Connel before he tears himself to pieces!"
"Yeah," agreed Roger. "I guess you're right." He flipped on the audio communicator. "Attention! Attention! Manning to Major Connel. Am making flight back to Polaris. All installations complete."
"Remember," Astro cautioned, "set the fuse for two hours."
"What took you so long, Manning?" barked Connel in reply. "And why didn't you answer me?"