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SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 93 



for measurement of pressure. The speed of the current in various 

 parts of the tunnel was measured by a pitot-static tube connected to 

 the manometer. 



Fig. 7. — Stanton's tunnel, 1903. 



Experiments were made in this very carefully constructed little 

 tunnel to determine the resultant pressure and the distribution of 

 pressure on round, square, and rectangular thin plates, normal and 

 inclined to the current, on lattice work, cylinders, and finally on model 

 roofs and bridges. The tunnel was still in use at the time when the 

 4-foot N. P. L. tunnel was constructed." 



*Inst. Civil Engineers, Minutes of Proc, vol. 156, pp. 78-139, illus., 1904. 

 Great Britain Adv. Comm. Aeronautics. Rep. 1909-10, p. 14. 



