Tree Stump Listening Device
This solar-powered concealment device was used to intercept radar & communications signals. Learn more about the Tree Stump Listening Device here.
Resources
Clock with Concealed Receiver
This CIA designed clock held a secret receiver inside that Moscow agents could use to send signals to meet.
Create Your Own Signaling Device!
Build a signaling device to “tag” a moving car, mark a dead drop site location, or send a signal from a rooftop at night.
Top Secret Telegraph Lesson Plan
In this inquiry-based lesson, students will use various materials to design and build a simple circuit with a switch. Then, they will use their circuits to send and receive secret telegrams (and intercept them, too.)