This paper presents a measurement of the mass of the W boson using dat
a collected with the CDF detector during the 1992-1993 collider run at
the Fermilab Tevatron. A fit to the transverse mass spectrum of a sam
ple of 3268 W --> mu nu events recorded in an integrated luminosity of
19.7 pb(-1) gives M(W)(mu) = 80.310 +/- 0.205 (stat) +/- 0.130 (syst)
GeV/c(2). A fit to the transverse mass spectrum ofa sample of 5718 W
--> ev events recorded in 18.2 pb(-1) gives M(W)(e) = 80.490 +/- 0.145
(stat) +/- 0.175 (syst) GeV/c(2). Combining the muon and electron res
ults, accounting for correlated uncertainties, yields Mw = 80.410 +/-
0.180 GeV/c(2).