nts by the Pitot tube, when the instrument is mounted close to some other body—as is so frequently 0225'drill, two the case in both flight and tunnel re- 5 taggered ro ws, 4 holes each, search—a series of tests have been made equally spaced. in the No. 1 (5-ft. atmospheric) wind tun- Fig. 1.—Pitot… … Fig. 2.—General view of sot-iip. Poriiendicular rod in i)lace for in.), the least count of the manometer vernier. interference tests I A complete description of this instrument appears in N. A. C. A. Technical Note No. 81. The least count of the vernier is 0.1 mm. 3
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