Abstract: An electrically controlled pattern tracer selectively uses stored detected pattern information from a sensor differently depending upon the value of a selected entered kerf entered to control the tracing element to follow a pattern turn. The tracer also distinguishes one type of pattern turn from another and delays use of stored pattern information for control of the tracing element by different amounts depending upon the type of turn detected and the entered kerf.

Abstract: A pattern tracer and method of tracing in which the movement of a racing element along a pattern is controlled in accordance with an effective forward offset which is selectively less than the actual forward offset to optimize the tracing for speeds less than the maximum tracer speed. The effective forward offset is established by providing control angles which are based on the pattern angles as detected in accordance with a selected criterion depending upon the type of pattern curve detected. The control angles are either calculated from the detected pattern angles or are selected from previously stored pattern angles. A kerf setting for lateral offset of the tracing element from the pattern is partially defined by the actual forward offset, so that changes in the effective forward offset do not cause any corresponding changes to the lateral offset or require changes to the kerf setting.

Abstract: A warning system for detecting a burned out or defective bulb for a motor vehicle is disclosed. A transmitting circuit is connected to detect current flow through the bulb to be monitored. Failure of the bulb to draw current causes the transmitting circuit to produce a series of small voltage pulses on the battery line. These pulses are detected by a receiving circuit which causes an outage indicator light to be illuminated.

Abstract: An alarm device for use in a vehicle which utilizes an audio frequency oscillator to drive a buzzer or tone device audible to the occupants of the vehicle. The alarm includes a control circuit which automatically stops the alarm after a preselected interval and may include modulated or interrupted alarm.

Abstract: A warning system for detecting a burned out or defective bulb for a motor vehicle is disclosed. A transmitting circuit is connected to detect current flow through the bulb to be monitored. Failure of the bulb to draw current causes the transmitting circuit to produce a series of small voltage pulses on the battery line. These pulses are detected by a receiving circuit which causes an outage indicator light to be illuminated.