Abstract: An automated multiple thermocouple testing device determines short and open circuits in a thermocouple system. The thermocouple system has a plurality of temperature probes, each probe has a first thermocouple and a second thermocouple. The device applies a direct current voltage to the first thermocouple to cause heating in the second thermocouple and then reads the temperature response of the second thermocouple. The first thermocouples have a common lead and the second thermocouples are connected in two parallel groups. The temperature output of the second thermocouple is digitized and read by a computer. These readings are compared to criteria which determines if there is an open circuit. Before the open circuit test is applied, the device also determines which thermocouple probe has a possible short circuit. This device can automatically test for short and open circuits in a thermocouple system within a few minutes without the necessity of removing the probes from their installed position.

Abstract: A two-component, interlocking foldable seat or support of cardboard, and the like, is provided from foldable blanks. Each component is folded into a closed, multi-sided shape and lightly locked together along its peripheral edges. Seating panels on each component extend from a rear sidewall, and are slotted to enable folding and engagement along corresponding slots of opposed sides.The two components are interfitted along slots that are aligned with the seating panel slots. The seating panels are then folded and engaged along their respective slots to produce a stable platform.

Abstract: A single blade proximity probe uses fiber optics to direct a laser output at turbine engine blades and to return the reflected light to an image intensifier probe which provides an output indicative of blade clearance. To enable the system to measure the clearance of a single blade tip on an operating turbine, a second light beam having a different wavelength from the laser output is directed over the laser light path to count the blades and to strobe the laser on the desired blade.