deflection of the center of the dia- phragm can be made approximately proportional to the square root of the differential pressure applied, provided the diapliragm is not too taut. (See fig. 14.) Owing to the fact that the differential pressure produced by an air-speed nozzle is proportional to the… … Fig. 1.—Types of Douiiietallic diiiphragin pressure elements Figure 1, B, shows a nonmetallic bellows quite similar to those used in the Toussaint-Lepere air-speed recorder.- The bellows is built up of sections of rubberized fabric cemented alter- nately at the center and at the outer edge. A large…
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