Ludwig Mach (November 18, 1868 in Prag; † September 1951) was a scientist.

Ludwig Mach was the eldest son of Ernst Mach who gaves his name to the Mach Number representing the ratio of speed of an object moving through a fluidnd the local speed of sound. From 1879 to 1883, Ludwig Mach attended das KK German High School in Prag, then he studied in a private school for 2 years. He also attended the public High School in Arnau in 1886-1887.

From 1887 to 1892, he attended Prag Medicin School and gratuated in 1895. During his studies, he also assisted his father in his physics lectures. At this time also started his cooperation work with his father. He mostly took charge of optic matters and instrument construction.

In 1889 the first joint publication was published. Since the 1890s, he pursued his father’s and Peter Salcher’s photographic attempts. In 1892 he developed, along with his father, the Mach-Zehnder Interferometer. In the same years, Ludwig Zehnder invented also the same interferometer but it appears both physicists conducted their work independently.

He invented in 1894 a new aluminium alloy, containing from 2 to 30 percent of Magnesium. He called it Magnalium and patented it. Thanks to its commercialisation, he was able to receive now and then substential amounts of money.

In early 1896, he began to work for Carl Zeiss in Jena, at the Ernst Abbe Institute, but he quit in september.

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