(1964) Koźmiński, C.; Bac, S.; Wyższa Szkoła Rolnicza w Szczecinie. Katedra Meteorologii
Employment of hydrostatic weighing methods enabled the authors to produce a registering hail meter with a measuring surface of 800 cm². A 1000 g increase of hr11 granules weight causes a perpendicular move of the hand (feather) by 200 mm. The prototype enables to read hail intensity with an accuracy of 10 g per 30 seconds as well as to tell the number of rainfalls from the particular hail storm.