An electro-mechanical device that produces high tension from revolving coils in the field of a powerful magnet, used to power the spark plugs in a simple petrol internal combustion engine.



Related Terms

DISTRIBUTOR

A rotating mechanism for internal combustion engines, to distribute high tension electricity to the spark plugs. It houses the cam- operated breaker points for the primary circuit.

DERATING

The reduction of the rating of a device to improve reliability or to permit operation at high ambient temperatures.

BURNER

A device which combines fuel and air in proper proportions for combustion and which enables the fuel-air mixture to burn stably to give a specified flame size and shape.

CROWBAR

  1. An iron or steel bar that is usually bent and has a wedge-shaped working end; used as a lever and for prying. 2. A device or action that in effect places a high overload on the actuating element of a circuit breaker or other protective device, thus triggering it.

ELECTRIC POWER METER

A device that measures electric power consumed, either at an instant, as in a wattmeter, or averaged over a time interval, as in a demand meter. Also known as power meter.

FIGURE OF MERIT

A performance rating that governs the choice of a device for a particular application; for example, the figure of merit of a magnetic amplifier is the ratio of usable power gain to the control time constant.

AIR-INJECTION SYSTEM

A device that uses compressed air to inject the fuel into the cylinder of an internal combustion engine.

CENTRIFUGAL MOLECULAR STILL

A device used for molecular distillation; material is fed to the center of a hot, rapidly rotating cone housed in a chamber at a high vacuum; centrifugal force spreads the material rapidly over the hot surface, where the evaporable material goes off as a vapor to the condenser.

AUTOMATIC SLIPS

A pneumatic or hydraulic device for setting and removing slips automatically. Also known as power slips.

CURRENT-CONTROLLED SWITCH

A semiconductor device in which the controlling bias sets the resistance at either a very high or very low value, corresponding to the off'' and on'' conditions of a switch.

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