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542 J. JASTROW in length, its altitude 20 inches. The slide and the base of the carriage were made of glass and kept frictionless by the use of oil. ILLUSTRATIONS OF THE APPARATUS. Fig. 1 represents the method of receiving an impression by the Hand, in this case the left hand ; the impression thus received is expressed by the right hand Fig. 1' at E, by a free movement of the arm. The eyes of course are closed. A, the platform upon which the arm rests ; B, the sliding car, moving upon glass tubc.-C, and carrying the block D mounted on a stand. The pencil, guided along the straight edge F, draws a line E on paper tacked upon a board G which can be moved under F.
