Clearfield Republican. [volume] (Clearfield, Pa.) 1851-1937, 1874-11-25

| Nhitn tut 'iaoB VI W., 'ff7
perial mantle of Charlemagnc-which
Is still preserved-are uncut octahedri-
calcrystals. In 1456 Robert dc Bcrghen,
a native of Brugcs in the Netherlands
discovered that a diamond might be
cut and polished by powder made
from itself, with the aid of certain iron
lwheels. Hence The vel lmownladh4 q
of ''diamond cut diamond = =
The earliest mention of the diamond
being used for writing on glass occurs
|in the sixteenth century, when the fol,
lowing lines, which may be considered
as the first application of the diamond
for this purpose, were written by Fran
els l. of France, with his diamond ring,
ON one of the panes of glass in the Cas-
tle of Champfort. The kings purpose
I'M writing them was to intimate to
4 Anne dc Pisselew, Duchess of Estam-
pes, that he was jealous of her;
souyent femme varc
saas Nal habit quis'y de
Womanis chanpnil as suwpners sky, Y s
.l1a 'Tis folly to trust her eonstaney.
After this, but still before it came
Unto the hands of the glazier, the dia-
mond was successfully employed in
etching or engraving figures on glass
vessels; and some very beautiful speci-
mems of this novel art were produced
at Venice ,as early as 1869. The, first
noted professional cngraver on glass
with tho diamond, Of whom anything
is known, was George lkchwanhardt
! In later times, John Rost, an artist Of
Augsburg, obtained great celebrity in
this art. Two drinking glasses, curl
1ously and elegantly ornamented by
this artist with his diamond pencil
were purchased by Charles vi. The
art of cutting glass with wheel, a
method applicable to crystal only, was
invented, in the beginning of the seven
tcenth century, by Casper Lehman
hpidary and glass cutter 10 the Em-
peror Rodolphus IL a. -r.y =, d
A knowledge of the diamond, how
ever, either fol- nse or ornament is not
at all of remote antiquity if We except
a few instances where itiwas employed
(but very intellectually for the latter
purpose, This is accounted for by its
requiring 90 be cut and polished before
| it exhibits any dcgrec'of that shining
quality which so pre-eminently distin-
guishes il from other minerals. Until,
therefore, the art of cutting was dis
covered (and that is not much more
than three hundred years since very
little use could be made Of II as in its
original rough state it is in no way at
tractive, being without lustrc or beauty
Of color. Before its introduction as an
agent in cutting glass, that operation
was performed by means of emery,
sharppointed instruments of thehald-
est steel and sometimes hot iron. "a
The diamonds employed in glass
cutting are Of the description known
by the technical name of bort, a class
ifcation which includes all such pieces
as are too small to bo cut, or are OF, q
bad color, and consequently unfit for
ornamental purposes. In considering
the diamond in its relations TO the pur-
poses of the window glass cutter, there
occur some circumstances worthy Of
remark. Among these may benoticed
that the cutting point of the diamond
must be natural one an artificial
point, however perfectly well formed,
will only scratch the glass, not cut It.
The diamond of ring, for instance,
will not cut a pane, but merely mark
il with rough superficial lines, which
penetrate but very little way inward.
Artificial points, corners or angles,
therefore, produced by cutting the dia-
mond, are adapted for writing or draw
ing fgunson glass. N The cutting dia-
mond does not write so well ON glass
from the circumstance Of its being apt
to enter too deeply, and to take too
firm q hold Of the surface, and thus be
come intractable Further, an acci-
dental point, produced by iracturing
the diamond, is as unfit for cutting as
an artificial one. Such a point will
also merely scrntch the glass. No
point, in short, that is not given by the
natural formation Of the mineral, will
answer tbc np,noses Of tbe window
glass cutter. The largo sparks, as tile
diamonds used for cutting glass are
called, are generally preferred to the
sha;r heinz iiIeE, 70 nossess Colthouch
,b;s % by % means ;nro,;oblv Tho case1
nn,nbsr AZ cutt;no no,nts ,sbile IN
,.as,' s,nal, s,.rIs 81 DIVISIONS raasons' a
ora nas ai,rars eonnd 40 ,,ossass r,arel
hon nna rIyns n ~ no;ni ~ tLe
iat,nr Il worn or hroLon ~ olthor,,h
.ho H. sra,l, "J ho ,n,nod ~ [ and rosn, IN ,s
snol 81 !, w;ll s,;ll ho w;thort tho nowor
of cutt;ng and consoonen,i,S useless
,nh Ia, ,hs ,arma,. ~, rn,lo,.ao;ng, tho
s,r,a % orara,;anS I'm H. ,,,.osen, ; ,e,y mi
oaant;,,na ,'o;nt Thd lsrra sra,.l1s aro
oailoJ ,ndtbar sna,Ls anJ are conc
t;mes cr, i ,ln,yr ;pto y ,uanv snolIc,.
Ga g,,en,s bea,inr ,ho same Mann a .
,haro ora natural s,o;n,s in tho so,,ner,
| Eaoh 90 ,hnse theretnre can nni, haye
o,,o cn,,;no ,o;nt and arc consconon,.
Iv onlv nranor,;onotelv voluahlo to
store5 % hy rese,,;ng
! Tha..,t In ,nona,,;nr ,h.,, ,a;.uond'
IN class cu,,;nn 90 So 70 nroducs ssl.c'
tive results can only ba at,aineJ Nv
cons;jeroblc eyner;cnSce THO diamond
must be held in nart;cular nosition
and with n nart;cular incl;no,ion 9TH
or,yise Il win NOT emf and tho sl;ghtest