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Grey Walter's Tortoises - Circuits

1951 - Original circuit for the Festival of Britain (FoB) Tortoises - BNI archives
How the Circuit Works

1953 - The Living Brain
The valves are a Triode and a Pentode, so this is the circuit for Elsie.

1957 - Science Material Center
Created by Alfred Bender for Edmund Berkeley for a proposed commercial toy version.

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