Abstract: An airport safety logic system includes a target state machine, a prediction engine, light-control logic, and alert logic. The target state machine receives a plurality of tracks, each of which includes information about an airport target object including a track number, position, velocity, acceleration, and a measure of the size of the airport target object. The target state machine also determines, for each track, a state of the airport target object at an airport including whether the object is stopped, taxi-ing, arriving, landing, aborting a landing, departing, or aborting a departure. The prediction engine utilizes, for each track, at least the position and the velocity of the object to predict a variety of things. The predictions include a maximum and a minimum distance the airport target object could travel in a period of time, and a maximum distance path and a minimum distance path the object could follow in that time period.

Abstract: Solder pot apparatus comprising a tank divided into first and second sections by a common wall with holes therein below the level of molten solder in the sections for the transfer of molten metal between the sections. The wall has relatively low heat conductivity. The sections are heated by separately controlled heating elements, the heating elements for the second section having a heating capacity higher than that of the first section, so that solder ingots may be rapidly melted in the second section without substantially affecting the solder temperature in the first section. A ramp extends from the first section to the second section and a powered skimmer stirs metal, and removes dross from metal, in the first section and pushes the dross over the ramp into the second section. Also, the apparatus includes a metal surface level sensor in the second section and signals and an ingot feeder conrolled by the sensor.