Vízügyi Közlemények, 1986 (68. évfolyam)

2. füzet - Fejér László: A vízsebességmérések fejlődése Magyarországon a vízrajzi osztály megalakulása előtt

A vízsebességmérések fejlődése Magyarországon a Vízrajzi Osztály... 281 Horváth. The equipment was supplemented by a velocity measuring log, by a Pitot-tube and by miscellaneous instrumentation. The carefully executed measurements were used for the explanation of several methodological and theoretical problems. Earlier, nobody in Hungary could carry out such accurate velocity measurements. Almost one year after Horváth's measurements (in 1877) a theoretical study-paper was published by J. Kvassay on the columns of the "Annales des ponts et chaussées". In this paper the relationship between number of revolution and velocity was discussed in order to find out a more suitable shape of the rotor. Organizations dealing with flood-protection and practical hydraulic construction required more and more regular hydrographical data around the years of 1870 and 1880. Hydrographical measurements were concentrated primarily in the Tisza-Valley at that time, because the efficiency of earlier interventions was investigated. The river-engineering offices - charged with the execution of such surveys - could not work at a uniform technical level. The measurements executed with different methods and equipment were not suitable for a uniform hydrographical characterization of a river. This contradiction was eliminated in 1886. At that time, the Hydrographical Section was set up, the first in Europe of this type.