Abstract
The apparatus involves a 20-channel 'contact' recorder in which one of the animal's rear paws serves to key a thyratron circuit when the paw makes contact with the runway floor. This is accomplished by constructing the runway floor of tinned copper bus bars embedded in wood at 1/8 in. intervals. Alternate bars are connected to grid and ground of a thyratron circuit. When the animal's left rear paw, which has been coated with silver paint, makes contact with adjacent bars, a thyratron circuit is completed. Resistance in the animal's other paws is too high to complete the circuit.
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