Freud's first book published in 1891 was a monograph entitled On Aphasia. In it he challenges the main authorities of the time by asserting that their manner of understanding aphasias is no longer tenable. Freud proves their theories wrong and presents his own conception of a speech apparatus. The apparatus is the foundation of his clinical and theoretical explanations about the speech function and its pathological manifestations. He built the model of an apparatus capable of explaining spontaneous speech, a function that the competing models of his contemporaries could not fully integrate. Freud's speech apparatus is the first of several models he created to facilitate the understanding of psychic functions. This paper is part of a series dedicated to an in-depth study of the earliest model which would provide the foundations for the understanding of its reappearance in Freud's later theories, and in particular in his analytic technique.