Measuring surface pressure along a circular wall of radius r = 12 cm, deflecting a jet Reynolds number 106 of width h. The pressure begins to decrease due to the transverse gradient to an angle 9° along the wall, then remains constant if the h/r ratio of the width of the jet to the radius is less than 0.25 along an additional angle which is "true Coandă effect", and finally increases back to the ambient pressure again over another angle 9°. If the h/r ratio is more than 0.5, the local effects 2 x 9° only occur and there is "no true Coandă effect". Experiments made by the author and J. Liermann in the laboratory of the author, SNECMA, published in: Kadosch M., "Déviation d'un jet par adhérence à une paroi convexe" in: Journal de Physique et Le Radium, avril 1958, Paris, p.9A.