If the screen width is 7 feet and the projector's throw ratio is 2.0 - 2.4:1 (because projectors have zoom lenses, they also have a range of throw ratios) then you can place your projector anywhere from 14 to 16.8 feet away from the screen.
A strain gauge (or strain gage) is a device used to measure strain on an object. Invented by Edward E. Simmons and Arthur C. Ruge in 1938, the most common type of strain gauge consists of an insulating flexible backing which supports a metallic foil pattern.he gauge is far more sensitive to strain in the vertical direction than in the horizontal direction.
COMPOSITE STRAIN GAUGE. HBM now offers a choice of preferred types of strain gauges for experimental stress analysis in composites. The new preferred types come with temperature response, measuring grid length and resistance perfectly matched to the requirements of measurements in composite materials. Moreover, users benefit from the preferred types' high availability and short delivery time, direct from stock.