The _visible_ part of the apparatus connected with the _invisible girl_ was thus constructed: first a mahogany frame resembling a bedstead, having at the corners four upright posts about five feet high, was united by a cross-rail near the top, and two or more cross-rails near the bottom, to strengthen the frame, which was about four feet square. The frame thus constructed was placed upon the floor, and to the top of each of the four pillars were attached as many strong bent brass wires converging towards the top, where they were secured by a crown and other ornaments. From these wires a hollow copper ball was suspended by slight ribbons, so as to cut off all possible communication with the frame. The globe thus supported was supposed to contain the invisible being, as the voice apparently proceeded from the interior of it: and for this purpose, it was equipped with four trumpets, placed round it in a horizontal direction, and at right angles to each other; the trumpet mouths coming to within about half an inch of the respective cross-rails of the frame surrounding them. When a question was proposed, it was asked from any side of the frame, and spoken into one of the trumpets, and an answer immediately proceeded from the whole of them, so loud as to be distinctly heard by the inquirer, and yet so distant and feeble, that it appeared as if coming from a very diminutive being. In this the whole of the artifice consisted; and the variations were so contrived that the answer might be returned in several languages, a kiss might be returned, the breath producing the voice was felt, and songs were sung, accompanied by the piano-forte, &c. To produce this illusion, the sound was conveyed by a tube, in a manner similar to the old and well known contrivance of the _speaking bust_; the invisible girl only differing in one circumstance; that an artificial echo was produced by means of the trumpets and hollow globe, in consequence of which the sound was completely reversed.