Vízügyi Közlemények, 1973 (55. évfolyam)

4. füzet - Rövidebb közlemények és beszámolók

(15) Characteristic figures on the research projects handled by the Institute during the 20 years of its existence have been published, grcuped according to domains of science and special fields, (Table 1) and in a pamphlet „Actives at the Research Institute for "Water Resources Development frcm 1952 to 1971" which is available from the Institute on request in Russian, English, or Geiman versions. 2. Muszkalay, L., Civ. Enf/r.: Simple current meter for measuring low velocities (For the Hungarian text see pp. 122) The new thermistor current meter is intended for measuring low flow velocities in settling- and clarifying basins, in small cross-sections, or in laboratory models. The principle underlying the measurement is that the dissipation coefficient of the thermistors depends on the material and movement of the surrounding medium. Electromechanical heat compensation, the application of a heat insulatid tank (Fig. 1) and constant voltage are characteristic features of this instrument. The thermistor applied is 35 mm long and 4 mm thick. The signals are received on a Wheatstone bridge (Fig. 2). A new solution has been devised for calibration (Fig. 3). The results of calibration are shown in Fig. 4. The potential fields of application of the instrument are numerous, including distorted river models, seepage models, settling basins and for detecting leakages. 10»