Abstract: An egg carton is fabricated of a single sheet of resilient material such as foam plastic or the like to define a multi-celled bottom tray coupled to a correspondingly shaped tray cover by a resilient hinge. The forward portion of the bottom tray further defines a latch flap secured to the bottom tray by a resilient hinge. The latch flap defines a pair of projections which are received within a corresponding pair of apertures formed in the tray cover. A notch is formed in the tray cover which exposes a portion of the latch flap allowing the user to force the latch flap inwardly and release the cover latch. With the latch released, the resilience of the tray cover hinge causes the cover to spring open exposing the carton contents.

Abstract: Measuring apparatus for use with a motor driven rotary saw blade is disclosed so that dynamic measurements can be obtained while cutting lengthwise a core sample from a well borehole. The core sample is held, and the motor driven rotary driven saw blade is used to cut along the length of the core sample. Selected transducers are installed, and all the transducers connect to a CPU which also has connections with a clock, memory and recorder. Data is recorded either as a function of time or as a function of the location of the cutting tool along the core sample. Transducers include a current monitor for current operating the motor, a microphone measuring sound levels generated by the saw blade cutting through the core sample, a tension measuring device which provides the force which causes the motor to traverse along the length of the core sample, and also X, Y, Z coordinate vibration sensors such as accelerometers.