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

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Author(s) Lenin
Written 1915


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Source: Lenin Collected Works, 4th Edition, Moscow, 1976, Volume 38, p. 333
Publisher: Progress Publishers
First Published: 1930 in Lenin Miscellany XII. Published according to the manuscript


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.) ”