Annales des Mines (1881, série 7, volume 19)
Page : Image 270
Révision de 30 janv. 2015 02:07:25, edited by Anonymes
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Page : Image 270
iintedrunm Im».
_
4I
,e;
---
4,/,,
L\
,
NK
>fr
IxN,
,11N.N
11111,11,--ü
e, eV
iii.A1 \
y/
,
e
,.
\ \. III \-N,,
,
.
,,