Aeronautic Instruments. Section III : Aircraft Speed Instruments (1923)
NASA Technical Reports Server (NTRS) · leaf 13
13 AIRCRAFT SPEED INSTRUMENTS tube. Instruments of this design are also used with Pitot tubes. In this case a knife edge projects from the sector T beyond the pivot V. The pin P makes contact with the knife edge on the opposite side of the pivot from that shown in figure 14 so that the direction of… … Fig. 13.—Elliott air-speed indicator, liquid type of the pointer is the same in both Pitot and Venturi instruments, although in the former case the diaphragms expand and in the latter contract. Figure 15 shows and improved type of Badin mechanism. A small contact disk P attached to the diaphragm…
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