Abstract: The disclosed invention is a measurement device for use in determining wind turbulence in the atmosphere, such as the cross-wind velocity and strength of refractive turbulence in a localized region. In the preferred embodiment, the device is comprised of: a telescope for collimating the light received from the light source, the telescope placed in front of a pair of spatially filtered optical receivers and focussed at infinity; a pair of gratings; a collecting lens, placed behind the gratings to collect the spatially filtered light; a photodetector to collect the light; an amplifier to amplify the signal received from the photodetector, and; a spectrum analyzer to analyze the interference pattern created by the gratings. The device uses the information contained in the light as it is scattered into its various Fourier components as the light passes through the atmosphere.

Abstract: A panel support column for supporting sheet rock panels in an overhead position during the fixed mounting of the sheet rock panels to a ceiling. The panel support column is comprised of a broad flat bearing plate, rotatably attached to a circular cross section support rod, a support barrel having a cavity which closely accepts the support rod for reciprocative movement, an upper and a lower retaining clamp, a compression spring mounted around the juncture of the support rod and support barrel, and an non-slip end cup on the lower end of the support barrel. The support rod has a plurality of height adjusting holes to which the upper clamp can be attached so as to allow adjustment of the height of the panel support column to accommodate ceilings of different heights.