His first experiments in Plzeň resulted in invention of the automatic electric arc lamp, the so-called "Plzen Lamp" (1881), for which he successfully defended his patent against Werner Siemens claim to have created it first.
His first experiments in Plzeň resulted in invention in 1880 of the automatic electric arc lamp, the so-called "Plzen Lamp" which was displayed at the International Exposition of Electricity in Paris in 1881. Later he successfully defended his patent against Werner Siemens claim to have created it first.