The Jasper weekly courier. [volume] (Jasper, Ind.) 1858-1922, 1894-11-23
RAPID STONE SAVING.


IN. Process ~ Accomplished by Chilled
Metallic shot.
The use Of chilled metallic shot has
completely rcvolutioned the stone-saw
lno trade. by reason OF the rapidity
9Th which the work can now be &C
.omplshed as compared with the times
vhen the saving material consisted
only Of quartzose sand. II IS obvious
that in saving granite. for instance
he sand alluded to, not being harder
nan quartz, was incapable Of doing
,,reh work, rs that mineral exists SO
,bnndantly in granite. What was want
4 vas something harder than quartz.
several minerals answered the purpose,
,mnnu which were corundum lemery)
ma the diamond The former of these Is
occasionally used for saving. and large
: for rubbing granite. marble and
he like. preparatory to the polishing
process; the latter has for some years
been employed to a limited extent for
.axing the hardest kinds OF stone, and
diamond disks may be found in the
workshops of every lapidary. But
hose minerals are rather expensive,
.snecially the latter. and until within
-.ren, years sharp sand was still almost
universally employed. Then new
material. known rs chilled shot. was
Introduced and was rapidly taken up.
During our visits to various granite
,enters in lss6-s7 we found 1t had al
-eadv gained a firm foothold, as the
ate of saving was greatly increased
nv lis use: il was also very economical
n working. and has been much
.mployed to this day. The fore
yoiny observations Were suggested
~ some samples and a trade descrip'
ion of "Krushite," which is said to be
new material. 1t appears TO be
.hilled metallic shot. and is very SINH
ar to. though probably not Identical
n composition with. what we saw IN
,se some eight years since. AZ any
ate the use OF chilled metallic sho
FOR saving hard stone is by no means
new" idea. .'krushite' is said to b'
,apablc of saving blocks OF granite a
g the rate of four inches and hard gri
.tone at nine inches in depth per hour
with twelve blades in the frame
II Is manufactured III S''ti"t $3.50.
INT sizes. the largest (about the size o
small rabbit shot being suitable 10
sandstone and the smallest zine dus'
for the rubbing bed. The material
used in sand blast apparatus in lieu Q
sand. and in substitution for diamond
in boring and drilling. II is describe
as being absolutely without points
edges. though we do not find this stat
ment borne out by samples sent Us
However. there can bc no question thi
the chilled metallic shot is by far IN
best and most economical materii
hitherto discovered for saving IN
hardest descriptions of stone and u
use in the initial stages OF rubin
Ii must be handled with gre
care. though. in the manufacture
marble. Only the other day we saw
beautiful slab utterly ruined duri'
the final polishing with putty powds
nv reason OF "A few chilled shots haviI
found their way under the felt p
Usher. with the result that the smoo
surface of the stone was deeply scor
before the machinery could be stoppe
That. OF course. is sheer carelessne
the fact that the chilled shot was car
BILE Of scratching SO deeply in such
short space OF time is distinctly in
favor as a saving material.-Lond
Ruilder.