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

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 .

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.)  ” |