Abstract: A self-contained microwave radiation detector is adapted for use in a microwave oven. The detector includes a non-metallic electrodeless sealed chamber in which a microwave-responsive gas mixture, such as a mixture of neon and argon, is located. In response to excitation by the microwaves radiation in the microwave oven, the gas mixture sustains a white glow which provides a positive indication that the microwave oven is in operation irrespective of the operation of other indicators. The non-metallic and electrodeless construction of the detector allows it to remain within the oven during extended periods of operation without damage to the oven or the detector. Also described is an improved microwave oven cooking utensil into which the detector has been integrated.

Abstract: The mining machine has a body portion mounted on a pair of endless propelling tracks which advance the mining machine forwardly in the mine. Pairs of forwardly extending arm members are pivotally connected to the body portion and support at their end portions a skid plate which is positioned transversely across the body portion and arranged to rest on and slide over the mine floor. A first conveyor is supported by the skid plate and receives and directs dislodged material from the mine floor to a second conveyor connected to the end portion of the first conveyor. The second conveyor discharges the dislodged material to the rear of the body portion. A support frame is positioned on the skid plate and horizontally supports a pair of transverse guide rails at the front end of the body portion. A carriage is slidably mounted for transverse movement on the guide rails and includes a rotatable supporting shaft.