Michael Derer

* Turócliget, January 18, 1847 – † Budapest, October 22, 1915 / smelter engineer, academic teacher ; ; He obtained a smelter engineer's diploma from the Mining and Forestry Academy in Selmecbánya. From 1871 he was an apprentice in Zólyombrezó, from 1872 he taught at the Selmec academy, from 1882 he worked in Zólyombrezó, Kisgaram, and Libetbánya. He perfected the manufacturing technology of Kisgaram enamel pots, developed and patented the production of hard-surface calibration cylinders for the Zólyombrezó pipe factory. From 1898 he was a ministerial mining advisor in Budapest, and from 1903 he was the Hungarian royal chief mining advisor. In 1875 he wrote a textbook on the new metric system, and in 1879 on ore and metal testing. 27 of his studies were published in the Mining and Metallurgical Journals (e.g. The geological conditions of the South African diamond fields, 1873, The Zvolen sheet metal factory, 1876, The structure of a new electric machine, 1877, etc.). His son-in-law Oszkár Toperczer (Lőcse, 1882 – Nyíregyháza, March 13, 1915) was a forestry engineer who died of typhus in World War I. ; ; His main works: ; The new, or meter-meter for domestic and public use, with explanatory examples and conversion tables (published in German and Slovak as well), 1875, ; Intelligence in extracts for the royal mining schools, 1879.