With the Ostwald's viscosimeter viscosity measurements were made on brines (concentrated sea water) of concentrations Bé 4.97°, 11.33°, 17.83°, and 22.65°. Temperature range was from 20° to 90°C. The experimental formula φ=1/η=a+bt+ct² was verified to fit well for interpolation and extrapolation to some higher temperatures. Based on this fact, tables of viscosity η and relative viscoity η/ηω were made by interpolation and extrapolation for temperatures from 20° to 120°C and for concentrations from Bé 1° to 24°. The relative viscosities varied only 2-3% in the temperature range concerned.