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.
The verb gauge means to estimate or measure, while the noun gauge is a tool you can use to make such a measurement. If you've ever seen someone check the air pressure in a tire, the instrument she used was called a tire gauge. The thickness, or diameter, of an item like wire (or the barrel of a gun) is another meaning of gauge. Thesaurus.