[en] The paper reports results of the X-ray diffraction structural studies of liquid 1-phenyl naphthalene, C₁0H₇ - C₆H₅ at 338 K, with the use of MoK_α radiation of the wavelength λ = 0.071069 nm. The curves of reduced radiation intensity were analysed by the reduction method of Blum and Narten. Experimental distributions of X-ray scattered intensity were compared with theoretical results predicted by the proposed model of 1-phenyl naphthalene molecule. (author)