> If however any mistake had been made by the attendant, and a wrong logarithm had been accidentally given to the engine, it would have discovered the mistake, and have rung a louder bell to call the attention of its guide, who on looking at the proper place, would see a plate above the logarithm he had just put in with the word "wrong" engraven upon it.
[...] The Engine will always reject a wrong card by continually ringing a loud bell and stopping itself until supplied with the precise intellectual food it damands.