Fuel and wear saving device

The combination of an inertial switch device with audible signal means and visible signal means wherein said inertial switch device comprises a casing having a closed circular chamber, the bottom surface of which is of a smooth concave surface, a drop of mercury disposed in the low portion of said concave surface and arranged to climb and descend the surface in all directions responsive to momentum developed therein, a central circular contact member, an adjacent circular contact member of smaller diameter and an adjacent circular contact member of larger diameter, said contact members being arranged in coaxial concentric relation to each other and disposed uniform distances from said concave surface, said drop of mercury being of such thickness as to contact each of said circular contact members as it passes under it in climbing and descending the concave surface and of a diameter such as to bridge two adjacent ones of said circular contact members, wherein said audible signal means and said visible signal means are embodied in said casing, and wherein electric circuit means including a source of voltage has a terminal of one polarity connected to said central circuit contact member and a terminal of opposite polarity connected to said audible signal means and to said visible signal means, said signal means being selectively energized depending upon whether the drop of mercury bridges the central circular contact member and the adjacent circular contact member of smaller diameter or the central circular contact member and the adjacent circular contact member of larger diameter.