Abstract: Flow measuring apparatus includes a support loop having strain gages mounted thereon and a drag means which is attached to one end of the support loop and which bends the sides of the support loop and induces strains in the strain gages when a flow stream impacts thereon.

Abstract: A glide path instrument for an aircraft to display to a pilot that the aircraft is descending on a predetermined inclined glide path. The instrument includes a rectangular casing mountable in stationary position in the aircraft and carrying a freely pivotable frame which has sighting elements at opposite ends spaced different vertical distances from the plane of the frame. The frame carries a pendulum-like structure including depending legs supporting free swinging weights. The sighting elements align in a single sight plane with a runway reference point when the aircraft is at the predetermined glide angle. A lamp in the casing illuminates the sighting elements.

Abstract: An invention in a rock core testing unit vibrator for generating a vibration at a controlled frequency for coupling to a barrel of a rock core test unit wherein a rock core cutting is jammed. In practice, the generator output is controlled to produce a harmonic or natural resonant frequency of the barrel of sufficient intensity to produce a resonant elastic vibration therein to shake that barrel relative to the rock core cuttings, dislodging the rock core cuttings that then fall therefrom under the urgings of gravity.