The new enterprise., 1905-04-06

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C-c.-z s5l5t-Lsatet pins was brought
o-t by a New Hampshire nan Il lS-i;
bat re srsr machine sor making pins
v-ch "a are IN uss today was perfected
u 1871 by Dr. John I Howe. ply.
s.c.aa n Bellevue Hosp.-a.. New NoFk.
Prom that ri-1@ % the present. in
provene,rs in p.I-makInZ machinery
have been made. until Tow the most
modern pins complete the Pm automat-
lcally In every way without the use Of
human hands except for the coioring
and polishing
The process begins with a spool Or
reel Of brass wire Of the right size for
the shank Of the pin. When the ma
chine .s started. a pair Of pIncers seize
the end of the wire and draw out a
portion Of 1t which runs between fixed
steel studs, and IS thereby straightened.
Two clamps. or checks now grasp
the end Of the wire. and a cutter de.
scends and cuts oh enough for one pin,
A small portion Of the wire IS left pro-
iecring from these cheeks. and from
this projection the head Of the pin IS
formed BY three rapid blows Of a form.
Ing die. which advance one.twentieth
Of an inch after each blow.
The Din. now released from the
clamps. drops to an inclined steel plane
provided with grooves just large
enough 10 admit the shank, but not
large enough 10 allow the head 70 pass
through. Held in place by these
grooves. the pins slide slowly down
the inclined plane until the pins begin
10 come in contact with a revolving
cylinder underneath.
This cylinder reyolyes on an axis
parallel 70 the line Of grooves down
which the pins are crawling. The sur
face Of It is cut into corrugations Ike
those on the face Of file. Indeed, the
cylinder is neither more nor less than
a great revolving file. AS it comes in
contact with the pins on one side only,
and as the pins are steadily moving
down the groove, the two forces to-
gether give them a rotary motion, so
that the revolving file gradually tapers
the points evenly on all sides. By the
time the pin reaches the end CT the
groove it has become fully pointed.
The pins, which drop from the
grooves into receptacles placed for
them, are next cleaned from grease.
In England this is accomplished by
boiling them in weak beer; in this
country by dipping them in an alkaline
solution. They are now ready for tin
ming.
In a copper pan are placed alternate
layers Of pins and finely ground tin.
Over this is poured a solution of bitar-
trate Of potash. The application Of
heat produces a solution Of tin which
coats all the pins
The polishing is accomplished by
placing the pins in barrels partially
illed with bran or sawdust. These
baSrels are then made to spin on aKles,
and the pins are polished by the fric-
ton.
The machinery by which pins are
"papered" is almost as interesting as
that by which they are made. 1t is the
invention Of a Connecticut man, who
thereby accomplished great saving Of
lnhnr. In annearance II is a steel box