The Ogden standard. [volume] (Ogden City, Utah) 1902-1910, 1909-06-26
SCIENCE NOTES

An interesting dredgc. which Is auto
matte In It's operation. has been working
on the river Vogo. 10 Russia for some
Nme for the purpose OF maintaining a
Svel river bottom by moving the dirt
from the high places and depositine 1t
at tue low spots. The dredge is the in-
'ention OF Russian noblcman Rarop
! Nicolos TomIni Beneath the craft there
| Is supported a screw by which the soil
is gathered up. There seems TO be al
most no limit to the width of the chan.
mel That may be cut by this dredge The
| screw cutting surface may be increased
as desired by the addition OF sections so
th0t in some instances as much as go
leet has been operated. The inventor is
OF the opinion that this is not of the pos
s'Dlc length. Hc says he sees no reason
J why the screw should not be made 600
ieet long IT found desirable The power
which drives this dredge is derived from
the current of the stream on which IL is
at work. In operation these sections are
secured together 10 the desired length %
the shore and then launched Into the
stream, where the Inc OF screws is SC
cured in beneath the dredge When the
craft is moved Into position where the
full force OF the current Is cncountered
the machinery is automatically set In
motion and the work proceeds This
novel piece OF mechanism has attracted
the general interest OF engineers abroad
and has been heartily indorscd by many
OF them. BY recent Improvement II ia
possible 10 deposit the soil on scows for
removal TO more distant points where its
presence may be desired.
By substituting disks OF csrbon for the
rods of the same material II has been
made possible to greatly reduce the size
OF the arc lamps and at the same time
N In ,tsh..
per cent. longer without renewal These
are important improvements. The eGl-
cheney OF the nrc lamp has always beer
limited by reason of the uncoual con.
sumption Of the carbon rods, which have
nod tendency to burn faster on one side
than another, and In this manner n per.
icct contact OF the two ends was possi-
Die only occasionally. In the new de-
sign which makes use OF the carbon disks
tue latter arc revolving all the time the
lamp is ln use and the arc Is made at
the edges OF the two disks. The 1Onm.
pere lnmp OF this design arc but 20 iuches
over all.
Sanitary car straps for those who arc
compelled 10 stand In the street cnra
are being tried in some OF the under
ground cnrs In use ia New York The
new strap" consists of n steel rod
"hlch Is suspended from the roof and
haylue a porcelain handle ut the lower
end These may be kept absolutely
clean whereas u recent examIuatioo az
cor strap which had been 10 service but
comparatively short time was found to
be reeking with all kinds of germs.
The cost of altering wnter by the slow
sand method Is given as follows In the
iHO' report OF the Lawrence, Mass. water
BOARD. During that year ], 1913. .oa5. .S79 gal
Ions were Uttered at a total cost OF sill
o4492, or about so 6s per ooo 0oo mi
hon The itemized cost per ], 900 200 c,Ilon
was; Removal of ice and SNOW. 81 oa4.
ecraPlng' S.f55: sanding, so 81. washing
and conveying sand, 81 80: litter r1aIn.
tcnonce and extras. sl.SS0: cary of
grounds. S0.6a4