An Experimental Investigation of the Positive After-Image in Audition (Classic Reprint) - Softcover

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Excerpt from An Experimental Investigation of the Positive After-Image in Audition

We chose the lights as signals because they were silent; but they were not reliable; and we now substituted for them small electro magnets from a player-piano. These magnets are not noisy; and when Operated by a weak current, just strong enough to produce a light, quick movement, they did not annoy the O's. To the armature of the magnet we soldered a strip of tin, 4 cm. By cm., to serve as signal flag. Every 0 had a magnet and flag in his booth before him, at the place where the light had been. When the current was Off, the flag stood almost vertically; when it was turned on, the flag was pulled quickly down to the horizontal.

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