Ludwig Darmstaedter.
Handbook On the History of the
Natural Sciences and Technique.
Berlin, 1908, 2nd edition

Written 1915 · page 333 · First published 1930 in Lenin Miscellany XII. Published according to the manuscript · Translated by Clemence Dutt

The excerpts from Ludwig Darmstaedter’s book “Handbuch zur Geschichte der Naturwissenschaften und der Technik,” Berlin, 1908 (Ludwig Darmstaedter, Handbook on the History of the Natural Sciences and Technique, Berlin, 1908) were entered in a notebook directly preceding the conspectus of G. Noël’s Hegel’s Logic.

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LUDWIG DARMSTAEDTER.
HANDBOOK ON THE HISTORY
OF THE NATURAL SCIENCES
AND TECHINIQUE

BERLIN, 1908, 2nd EDITION

(Lesesaal in der Landesbibliothek)
 
Determination of the velocity of light:

1676:	Olaf Römer (from the eclipse of Jupiter): 40,000 geographical miles (less than....                              (less than....	300,000) km. per sec. 298,000 km.)
1849:	Fizeau (toothed wheel and mirror): 42,219 geo- graphical miles . . . . . . . . . . . .	= 313,000 km. per sec.
1854:	Foucault (2 revolving mirrors, etc.): 40,160 geo- graphical miles . . . . . . . . . . . .	= 298,000    ”    ”    ”
1874:	Alfred Cornu (à la Fizeau) . . . . . . . . . . . . . . . . . .	300,400     ”    ”    ”   300,300     ”    ”    ”
1902:	Perrotin (idem) . . . . . . . . . . . .	299,900 (±80 m.)  ”

 

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