9. The Robinson automatic system is admittedly the only signal system ever produced that meets all the requirements of safe and rapid railroading. 10. Robinson's subsidiary invention of the rail bond, made more than fifty years ago in connection with his automatic system of signaling, and now in universal use on all electric roads using the track return, throughout the world, has made possible electric railroading as practiced today. Without this Robinson bond or its equivalent those electric roads using the track return could not be operated. 11. The Robinson automatic system is a humanitarian invention of the very highest order, to which thousands of travelers by rail are indebted for the preservation of life and limb. [Illustration: W. ROBINSON. Improvement in Electric Signaling Apparatus for Railroads. No. 130,661. Patented Aug 20, 1872.] UNITED STATES PATENT OFFICE WILLIAM ROBINSON, OF BROOKLYN, NEW YORK. Improvement in Electric-Signaling Apparatus for Railroads Specifications forming part of Letters Patent No. 130,661, dated August 20, 1872. Be it known that I, WILLIAM ROBINSON, of Brooklyn, in the county of Kings and State of New York, have invented a new and useful Electric Signaling Apparatus for Railways, of which the following is a full, clear, and exact description, reference being had to the accompanying drawing forming part of this specification. The figure represents a top view of a double-track railway, with suitable sections and wire connections, together with an elevation of the signal-box with its face removed to show the signal within, the whole being arranged to illustrate my invention.