Andrija Mohoroviçiç 1857 - 1936 Andrija Mohoroviçiçi is famous for discovering the inconsistency in the internal structure of the Earth.Andrija was born in Volosko, a coastal village of Istria, where his father was a blacksmith who produced anchors.He finished the elementary school in hometown, secondary school in Rijeka, and high school for mathematic and physic at the University of Prague. When he was 15 years old he could speak Italian, English and French. Later teachedGerman, Latin and ancient Greek. He strarted his career as a teacher in a high school in Zagreb, but quickly he transferred to a maritime school in Bakar. There he gave lessons in meteorology, field that attracted so he started to get systematic observations and measurements. To measure horizontal and vertical velocity of clouds,he used instruments projected and built by him.He was sclupurous in his daily work. Later (1907) , in the "Guidelines for surveillance of rainfall in Croatia and Slovenia," he wrote: "Whoever who does not perform this work conscientiously, will not be included in the monitoring of rainfall". All the data collected from the surveys were the basis of his doctoral thesis “ A observation about the clouds and daily and annual periods of clouds in Bakar" presented at the University of Zagreb. He discovered that the earth has a layer a few tens of kilometers thick.
The father was a blacksmith who produced anchors.
He discovered that the earth has a layer a few tens of kilometers thick.
He returned to Zagreb and continued to work in the meteorological observatory which managed to extend network throughout Croatia. A rare event observed at that time was the tornado of Novskit (31 March 1892) when a wagon train ,13 tonnes with 50 passengers were tossed at a distance to 30 m. Since 1900 his interess focused on Seismology. During earthquakes on earth spread two types of waves, longitudinal and transverse, with different speeds. When seismic waves belonged to the border which separats the different materials in nature, they are partially reflected and broken. By analyzing data from seismographs of a dozen stations, Mohoroviçiçi showed that the Earth consists of a core with a surfaced and interior layer . He failed to appreciate that the thickness of the upper layer was 54 km. Today it is known that it fluctuates between several kilometers of ocean seabed at 70 km under the high mountains. This lack of consistency in the structure of the Earth named after Mohoroviçiç. It is interesting that a problem based on his perceptions gave competitors XVII International Physics Olympiad for secondary schools held in London in 1986. She married Verni Silvia and had four sons