Let us next transmit between these two stations a series of horizontal lines. To do this we duplicate our first apparatus. We place a second rheostat along the foot of our sending tablet, not along its side, and slide a second wire along its bared surface with motions always parallel to those of the marking pencil. Thus a second current, going by a wire of its own to the receiving station there repeats through a second coil, or solenoid, the horizontal marks of our sending pencil. We have now two sets of apparatus, alike in all respects, one sending rheostat at right angles to the other; one receiving solenoid at right angles to its mate. In the actual telautograph the rheostats are curved, as shown in the picture facing page 318, and they are so joined by levers that the up-and-down and sidewise motions of writing are accurately represented, from moment to moment, in the two varying currents sent afar. As these currents arrive they actuate a pencil, similarly furnished with levers, so that it moves in a path which exactly corresponds with that of the sending pencil. The apparatus has an ingenious ink supply, and a device to shift the paper as filled line after line. In its basic features the telautograph was invented by the late Professor Elisha Gray of Chicago. Its present form is largely due to the modifications and additions of Mr. George S. Tiffany of New York. The instrument is giving satisfactory service in thousands of banks, factories, hotels, business offices, and households. Its records at both ends of a line make it of inestimable value in many cases, as aboard a warship where orders of the utmost importance may be committed to its tablets. Exterior and interior views of the instrument are given facing page 318. [Illustration: TELAUTOGRAPH, EXTERIOR.] [Illustration: TELAUTOGRAPH, INTERIOR.] Machines Cannot Directly Imitate Hands: A Task Must be “Coded.”