Circuit Controlled Silo
Allows a circuit signal to control when a rocket is launched
Using the special combinator in the bottom right corner
Send a negative "Rocket" signal to the "Smart Rocket Silo" to disable auto-launch
Send a positive "Rocket" signal to the "Smart Rocket Silo" to enable auto-launch
The same combinator also gives you a count of what has been loaded into the silo.
This way when you send white science into space, you can control how many fish you get back.