It is rumored that Superman will guard the ray machine.
3 seconds sound clip from Superman (1948) - Superman To The Rescue (Chapter 8).
You can hear this line at 00:06:59.152 in the Blu-ray version of the episode.
Quote context
[...]
- Good. It must be done swiftly and secretly.
- I agree to the swiftness, but not the secrecy.
- At the risk of losing the reducer ray?
- We won't lose it, I promise. But it may enable us to capture the Spider Lady and Dr. Hackett.
- It is rumored that Superman will guard the ray machine.
- My Washington contact has informed me as to the route chosen.
- But what good will that do us if it's so closely guarded?
- My men will be there before the area is closed.
- Erwin and Jackson will stop the truck.
- How do you know the ray machine will be in a truck?
- I have definite information.
[...]