The Bottineau courant. (Bottineau, Bottineau County, N.D.) 1895-1929, 1915-01-15
A MILE UNDER GROUND.

a MILE UNU6K GkuUNu.
Result Of ar Interesting Experiment at
a Michigan Mine.
In reference to the deep mine shafts
at Calumet some experiments ON
dncted by members Of the faculty of
the Michigan College of Mines are in.
teresting. says the Engineering Maya
zine. 1t had been noticed that in the
II some ore or rock were spilled nea
the surface. men working in the bottom
OF the shaft a mile below were not
much bothered and sometimes only %
e .'"ed "a little dust" It Is stated
that = car Of broken rock could ba
dumped into the shaft without injury
to a man standing directly underneath
q mile down The reason is that the
rock would never reach the bottom but
would lodge in the sides OF tho shaft
ON the timbers which protrude = few
inches At intervals: that Is. the rock
would no. fall straight. since these
shafts are exactly vertical.
IN the experiments conducted two
round metal balls we're dropped into
the center Of 4 shaft BY burning
threads by which they were suspended.
so az to give them no lateral motion
1t was tried to catch the balls in a box
of clay In the bottom of the shaft; none
of them we're caught. One ball was
never found afterward. The other was
found in the east wall of the shaft only
2 few hundred feet below the surface
The explanation il that the earth Is
revolving from west to east. which
gave the ball an eastward component
in its fall because d particle on tb"
surface of the earth Is travelling at a
higher rate of speed than n nearer
the center. although at the same angn-
TAR velocity. Thus a ball or rock drop
ped in the shaft will strike the east
wall n few hundred feet from surface
possibly then reboupding several times
in it's drop until it lodges on q timber
Of Oh = level.
STOW. Coal IN Demand.
Stove nnd chestnut sizes of anthra
cite roa, are in the greatest demand
and make up over 40 per cent of the
total shipments from the mines. accord
ing 10 the United States geological
vpy. They arc essentially domestic
sizes. and the relatively large proper
MON they make Of the shipments serves
~ IN index to the conditions govern
ing the anthracite trade. Egg coz
finds its way principally to the fur
naces Of residences. and pea coal Is
used in the same way to some extent,
though it is also nsed for kitchen
ranges and some Of It goes with the
buckwhqat and smaller sizes for nse
as steam coal The same sizes come
directly into competition with bitumi
nous coal and are sometimes used mix
ID with Unanimous coal for generating
steam. chiefly in hotels. apartment
bouses and office buildings.
New Burglar Protection.
Safe blowers will have a new protec
tive device to combat in the neal
furure in the torn Of q chemical com
pound. designed to produce blindness
A glass container holding n pound 81
tn. gas producing chemicals Is sus
,pnded bet een the outer and the tnne'
doors or walls of the safe. When tn
easing OF the safe ia blown or drilled
| the glass receptacle Is broken. ant
when the door is opened the powerful
fumes ut once render the burglar sight
less. and if he fails to lind his way on
of the room ne becomes uncOnsciou
for several hours. The flask is bell
net wpen n number Of felt surfaces t.
prevent accidental breakage when tn
safe ia being closed.
Imports Of Salt.
Common salt continues to be import
ed In considerable quantity. o tina
1OOO.m barrels coming to Atlanti
norris last year. according to the Unite
St0tpS yp.,i"yi.Ai survey The t'Onntr
n amply nthp however. I" supply tn
entire hOu". d"mnsh n@ the capacit
~ Il. sui, ,~,i,,+~ mt works II IN 81
..rs. ~ ~. i,r.>st,i ,urfilHt The m
..,rf> nv, ,..r. M..r. .,ntA ~ Der cer
i ~. t,t:. ....rs. ,n,s.inn rhereas
-. ~. ,.. ..,.M vrs u Z.