Abstract: A deceleration warning indicator adapted for use in automotive vehicles of the type having a throttle rod extending intermediate an accelerator foot pedal and the engine carburetor. The system includes an energized electrical circuit and a deceleration movement of the throttle rod, as the vehicle operator releases foot pressure from the accelerator. The system is characterized by its simplicity and ease of installation and includes an independently mounted reciprocable switch closable with a throttle rod projection to activate the warning lamp.

Abstract: An improved form of bowling calculator which allows for interposition of either of two covers upon a main frame that carries bowling lane indicia. Each of the interchangeable covers includes an elastic member extending longitudinally within the cover with a plurality of adjustment means spaced along its length. Each cover is freely positionable upon the main frame by an access opening which fits over a registration pin extending upwardly from the surface of the main frame. With this improved device, a characteristic ball curvature may be defined for each of two distinct bowling lanes by individual adjustments of the elastic member within each of the covers, thereafter each cover may be interchanged upon the main frame as two bowling lanes are being used, for example as in tournament play.