Daily Kennebec journal., 1898-05-06

not the same precision used IN adjust
ing their weight as in the coinage 81
| the unlimited legal tender money.
When the pIanchets are found to be
correct as to weight, they are placed by
hand into vertical tube feeding re
ceptacle on the outer edge Of 1t steel
wheel revolving horizontally. This
wheel has grooves cut on its edge, and
there is a corresponding groove on the
encircling but stationary rim. The
panchets are carried around by fric-
ton in this receptacle. and as they roll
around making a complete circle, ana
drop into Il box, we find that the re
volvng wheel has compressed their
edges so that we have a nicely rounded
and polished edge raised triile above
each face.
As this edge is a little higher than
the face of the engraving on the coin
it facilitates making snug piles, very
desirable feature in coins. This in mint
usage is called milling. ii is a special
nomenclature used in coinage, as by
mechanics in general Il reeded edge IS
said to he a milled edge In mint terms
the serrated or notched edge one sees
on our coins, like silver dollar, are
said to be needed.
A scent nickel piece has a milled
edge only. while a 10-cent niece has its
edge first milled and afterWard reeded.
| our cents are milled but not reeded.
| All finished nlanChetS are heated red
! hot and momentariIy dipped into Il
mild acid solution, which cleans them
and eats away a minute portion Of the
conna, rbis annsalino ITS the nIan-
chat for tho final nrocess of coming.
The coinino nress is an accurately
made and nowerful Niece of machin-
a,v Tba dios consist of three parts~
tho ho,ton die the ION die and y steel
,ine, ~. collar This rollat is NOT com
monIv called . Gie. hut il nils an i'm
1 ,,,,.,.,r, f,,n.+io,, si,,,iIa, tn = dia 1aav-
ino its imnrassinn ON the edge Of the
J cnin The ro1,ar fer tho. coins win, ser
rat,.d ado,. has the inner edge carefully
and accnratelv reeded exactly as vou
seq tba imnrirt an thp e,lsse of njIr sill
ya, dnlla, Tho hntto,o die and collar
oy5 nicel, aainstcd hv set screws. ana
rao,afn stationary. ON the nr4ss while
| the ton dia is secured 10 the moving
mart
rha o1anchats ara fed nv hand intn
! he hAIH1no a 10
| a. .,.o,, r,,.o1u,jun of tho Gv,yho.l
| pin,hlo nair of steel Gpa.rs aut,nati-
| cal1,- catches th. lowest one Of tro
/ nIancbat and uIaces il accurately. in
| nositio, ON thn bottnn, dia anl then
/ aats o,,t If tha. way fo,, tb. haa,-. bIn,y
| Of Tho ton die Ar ono stroke the coin
| H. ,,o,1a ,rbn .c,,,,nraesion il ., e,..at
| as to heat the coin At the next revo-
luton these steel fingers again reach
| in and push away the newly made coin
| and replace it with a blank planchet.
| \ coin is struck by a very heavy and
! almost instantaneous blow ON the plan-
/ chet concentrating BY means OF levers
acting ON a knucLle Joint. the mumru-
! tum of a heavy fly wheel and some
I other moving parts Of the press The
! cold metal. by the enormous pressure.
! is simply made Ia flow as a LIQUID. tax
! ing the exact impression Of tEe dies
and collar. The retaining frame ana
! working ua.Ts of a press are seemingly
] enormously strong for the dutv tlev
are eXoected 10 do.
These dimensions were not uhtainc!
/ by nice mathematical calculations. hlt