A study of W-pair production in e+e- annihilations at LEP is presented, based on 877 W+W- candidates corresponding to an integrated luminosity of 57 pb -1 at √ s=183 GeV. Assuming that the angular distributions of the W-pair production and decay, as well as their branching fractions, are described by the Standard Model, the W-pair production cross-section is measured to be 15.43+/- 0.61 (stat.) +/- 0.26 (syst.) pb. Assuming lepton universality and combining with our results from lower centre-of-mass energies, the W branching fraction to hadrons is determined to be 67.9 +/- 1.2 (stat.)+/- 0.5 (syst.)%. The number of W-pair candidates and the angular distributions for each final state ( q q l ν l, q q q q, l ν l l' ν l') are used to determine the triple gauge boson couplings. After combining these values with our results from lower centre-of-mass energies we obtain ∆ κ γ = 0.11+0.52-0.37, ∆ gz_1 = 0.01+ 0.13-0.12 and λ = -0.10+0.13-0.12, where the errors include both statistical and systematic uncertainties and each coupling is determined by setting the other two couplings to the Standard Model value. The fraction of W bosons produced with a longitudinal polarisation is measured to be 0.242 +/- 0.091(stat.) +/- 0.023 (syst.). All these measurements are consistent with the Standard Model expectations.