Abstract: The tachometer includes a microphone for disposition next to the exhaust of the vehicle and an accelerometer for disposition adjacent to its engine. A selected one of the outputs is connected to an ADC which provides digital samples to a central processing unit. Also, the ripple from the battery is sampled and provided to the CPU. The CPU calculates a constant representing the relationship of the frequencies of the ripple samples and the mechanical samples and responds to the ripple samples and the constant to provide output signals corresponding to the speed of the engine. The speed is displayed.

Abstract: Metallic coating compositions for aluminum profiles providing stability and weather and chemical resistance even when applied as a single coat suitable for use inter alia with the Ransburgh turbo-disc electrostatic spray system comprising:(a) a highly elastic cross-linking polyacrylate coating resin;(b) a suspending agent;(c) a plasticizer;(d) a polar solvent mixture of(i) a butyl alcohol;(ii) butyl glycol; and(iii) aromatic solvents;(e) a pigment mixture of(i) non-leafing metallic pigment; and(ii) color pigment;a method of coating aluminum profiles and aluminum profiles coated therewith.

Abstract: The tachometer includes a microphone for disposition next to the exhaust of the vehicle and an accelerometer for disposition adjacent to its engine. A selected one of the outputs is connected to an ADC which provides digital samples to a central processing unit. Also, the ripple from the battery is sampled and provided to the CPU. The CPU calculates a constant representing the relationship of the frequencies of the ripple samples and the mechanical samples and responds to the ripple samples and the constant to provide output signals corresponding to the speed of the engine. The speed is displayed.