Fejér László – Lászlóffy Woldemár: A hidrometria magyarországi fejlődése (1700-1945) (Vízügyi Történeti Füzetek 13. Budapest, 1986)
Idegen nyelvű összefoglalók
39. Telemetrie telescope of István KRUSPÉR, professor of geodesy at the technical university. The right-hand half of the objective lens was moved by a micrometer screw. The pole standing on the bank, furnished with two signal discs was aimed at and the movable half lens was set in such a way that the image of the upper disc coincided with the lower, in the image given by the other half lense. The magnitude of lens displacement was proportionate to distance. The instrument was fixed to the wall of the observation cabin on the floating bridge by means of bolt c. 40. Equipment in the Békéscsaba irrigation system in the 1910s for the continuous measurement of water conveyance of an irrigation canal. Rotations of a current meter fixed under the raft were recorded by the instrument in radial direction from the centre on a circular plate turning around in 24 hours. Ede VICZIÁN 41. Current meter designed by E. VICZIÁN. Wheels surrounding the shaft of the vane — instead of a ball bearing — were less sensitive to oxidation and, in addition, the maintenance of the instrument was simpler than that of the Hajós-type meter. This highly sensetive instrument was not used for fluvial measurements but for measurements in small brooks and irrigation canals and to measure the guaranteed delivery of pumping stations. 42. Drawing of a Pitot—Darcy tube used by Ignác HORVÁTH, Water entered the dynamic tube (b) through slot p and the static tube (a) through slots a i and a 2 . During measurement a caoutchouc pipe was connected to tap d and by sucking this pipe, the water columns in tube a and b, respectively, could be raised to eye level. Followingly, after turning off tap e, readings were made for the heights of water columns by means of a graduated cylinder, equipped with vernier c. Value h proportionate to velocity was given by the height difference of the two columns. Drawbacks of this instruments were that h was usually a very low value which was difficult to determine with the required accuracy; and that for greater water depths the Pitot—Darcy tube couldn'-t be used without break hazard. 43. Results of flow velocity measurements executed in the Vaskapu (Iron Gate) Canal on the 8th June of 1897. 44. Ignác HORVÁTH's equipment for his traction experiments in 1876, arranged for the determination of the current meter coefficients and executed in the swimming pool of Császár Bath with velocities lower than 0.8 m/s. 45. Stretch of the Soroksár Danube branch upstream of the former Gubacs dam, the scene of traction experiments performed by Ignác HORVÁTH with velocities between 3 and 4 m/s. 46. Cart used by the Hydrographie Section at Szolnok for calibrating current meters; almost the same type of cart was used up to 1985. 47. Calibration of a velocity meter in the settling basin feeding Lake Városliget. 48. Instruments of the calibration cart. 49. Experiment of Sámuel HAJOS in connection with the starting of current meters. 50. Form of a plane-vane according to KVASSAY. 51. Developed pall of the Hajós-type vane. Béla TIMON 52. Discharge rating curve pertaining to the Budapest cross-section of the Danube. 53. Development of discharges in the Tisza and Maros rivers between the 17th and 27th of April 1900, upstream and downstream of the confluence. 54. Development of discharges in watercourses feeding the Makerló reservoir, and the simultaneous volumetric increase in the basin (m 3 /s) in the course of experiments in July 1901,
