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ERNST MACH (1838-1916) Austrian physicist & philosopher; conducted considerable research in the f...

Currency:USD Category:Everything Else / Other Start Price:NA Estimated At:1,000.00 - 1,500.00 USD
ERNST MACH (1838-1916) Austrian physicist & philosopher; conducted considerable research in the f...
ERNST MACH (1838-1916) Austrian physicist & philosopher; conducted considerable research in the field of ballistics. The "Mach" number, the measure of the speed of sound, is named after him. Autograph letter signed, "E Mach", on a postcard, April 17, 1898, Vienna, to the philospher and sociologist Wilhelm Jerusalem (1854-1923), in German. "...If you could give Robot back to me, I would be very grateful, as I will need the book soon..." Scarce. VG. $1,000-1,500