The advantages of using a transverse magnetic field for precessing the polarization of fast-neutrons are discussed. Design details of a powerful electromagnet supplying a transverse field of approximately 20 kG are given. Precession characteristics for polarized fast-neutrons obtained at 50° (lab. syst.) from the 7Li(p,n) 7Be reaction are reported, using elastic scattering at 42° (lab. syst.) off natural as an analyser. Correlation of the precession data with theoretical predictions presented elsewhere is made and good agreement is found.