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rUIttTT OF COMI'KESSFD A III
INTERESTING EXPEKIMEN?!'S.
Tlio rcliaueo placed for wntilaticni on
tho compressed air supplied prhiianl.,' for
oporJitin^ t-he rock drills readers 1 lt»? con*
fiiiloration of <lie purity of t!-o air thus do
livcrccl u matter of considerable importance,
III a paper read before tho last meeting of
tho Aaaerica.'i AacsociaUou ;for tlw Ad
vancement of Seiencv by .Mc.-sr.s. 1\ \Y.

MT\air r.ud G. A Koninu, it was stated
that analyses of the nir from ihe compres
sor at tJio Victoria mine in the Michigan
copper district, determined by a Hoinwi
pipetto charged with phosphorous., mivo nn
oxygen contour of only 37.7 per cent;., as
compared with the 20.93 per cent, of <ior
.inql air. and it i3 also recorded that simi
lar psrcentnf^i was obtained in sonu re
cent investigations at Cobalt,. No dotei
munition's of tho other constituents of the
air arc ^ivon. Expcnuimcnts made with
candles show t-ln.t tlio air derived from
tho compressor was contaminated to-a very

considerable extent. .

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