The authors try to precise the distribution of a Newtonian fluid at the level of a glass-tube bifurcation, a model grossly similar to blood vessel branches. Different types of bifurcations are obtained by means of translucent polyester resins. The length of the tubes is chosen in order not to alter the flow at the entrance and at the outlet (the length is approximately 90 times greater than the diameter). The fluid used is a mixture of water and glycerin; its viscosity is determined according to the temperature. The flow rates are measured by chronometry and the pressure with a pressure gauge made of capillary tubes. With certain hypotheses, the geometrical characteristics of the bifurcations permit the calculation of the induced charge losses; however, the shape of the area of influence and its evolution cannot be accurately precised.