Decremps in his exposé, "The Conjurer Unmasked," published in 1784, thus describes the automaton and its work: "Our attention was next called to observe an automaton figure, that vaulted upon a rope, performing all the postures and evolutions of the most expert tumblers, keeping exact time to music. By seeing Mr. Van Estin wind up the figures, and being shown the wheels and levers contained in the body of the automaton, caused us to believe it moved by its own springs, when Mr. Van Estin thus explained the deception: 'To make a figure of this kind depends a great deal on the proportion and the materials with which it is composed: The legs and thighs are formed out of heavy wood, such as ash or oak; the body of birch or willow, and made hollow, and the head, for lightness, of papier-maché. The figure is joined by its hands to a bar of iron, that passes through a partition, and is turned by a confederate; the arms are inflexible at the elbows, but move freely at the shoulders by means of a bolt that goes through the body; and the thighs and legs move in the same manner at the hips and knees, and are stayed by pieces of leather to prevent them from bending in the wrong way. The bar is covered with hollow twisted tubes, and ornamented with artificial flowers, so as no part of it can be seen to turn; the confederate by giving the handle a quarter of a turn to the left, the automaton, whose arms are parallel to the horizon, lift themselves by little and little, till they become vertical and parallel to the rest of the body; if in following the same direction, the other part of the body moves forward; and by watching the motions through a hole, he seizes the instant that a leg passes before the bar, to leave the automaton astride; afterward he balances it by jerks, and causes it to take a turn around, keeping time with the music as if it was sensible of harmony. "N.B.--Three circumstances concur here to favor the illusion: First, by the assistance of a wire, the confederate can separate the bar from the automaton, which, falling to the ground, persuades one it loses itself by real machinery. Secondly, in winding up the levers shown in the body, confirms the spectators in the idea that there is no need of a confederate. Thirdly, the tubes that are twisted around the bar, except where the automaton is joined to it, seem to be the rope itself, and being without motion, as is seen by the garlands which surround them, it cannot be suspected that the bar turns in the inside, from whence it is concluded that the figure moves by its own machinery." According to one of de Philipsthal's advertisements, page 103, the trapeze automaton which he featured was six feet in height. But Pinetti programmes show that he had a smaller figure known as the rope vaulter. This is probably the trick exposed in Decremps' book. On page 108 will be found a Louis programme of 1815, on which a figure is thus featured: "TWO ELEGANT AUTOMATA