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Marcus was Jewish in ethnic sense, although he converted protestant after. He was born in Mecklenburg-Schwerin which became later a part of the German Empire. He never became Austrian / Austro-Hungarian citizen. In a letter Marcus wrote to his brother he described himself "philosophical German", what ever it means. Anyway, Marcus should be categorised rather German than Austrian.
Very little is known about this talented scientist compared to that how much is written about him. Many instances have patched with imagination their deficiencies in knowledge. Therefore all information about him should be treated with caution. --Gwafton (talk) 22:12, 20 July 2013 (UTC)Reply
The catalogue for the 1873 Vienna International Exhibition should assist in determining the validity of some claims. A 1907 source refers to it containing a picture of his 1873 vehicle. NealeFamily (talk) 02:24, 21 September 2016 (UTC)Reply