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Isotope shifts and hyperfine structures of four transitions in W I have been measured as well as isotope shifts in Lu I by means of atomic-beam laser spectroscopy. Magnetic-dipole hyperfine constants 3 of '"W are determined for the atomic states 'D&, 'F&, and 'F3 of the 5d 6s6p configuration. The nuclear parameters A, and 5(r') are derived for W stable isotopes. J dependences of the isotope shifts are observed for the D term of the 5d6s configuration in LuI and the 'D term of the 5d 6s configuration in WI. Parameters z, d of the crossed-second-order effects are derived for the LuI Sd6s and WI 5d 6s configurations, and zsd /A, is found to be 411(26) MHz/fm for W. A systematic behavior of the normalized parameter z"t /A, g", is discussed. PACS number(s): 32.30.Jc, 32.70.Jz, 35.10,Fk, 21.90.+ f

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